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                    "id": "spec_2_group",
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                    "id": "spec_2_position",
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                    "id": "spec_3_position",
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                    "id": "delta_mono_mass",
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                    "id": "spec_2_neutral_loss_44_flag",
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                {
                    "id": "spec_2_site",
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                    "id": "spec_1_misc_notes",
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                    "id": "spec_3_group",
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                    "id": "delta_composition",
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                    "id": "username_of_poster",
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                    "id": "username_of_poster",
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                    "id": "spec_1_classification",
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                    "id": "spec_2_group",
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                    "id": "spec_2_position",
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                    "id": "record_id",
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                    "id": "spec_1_position",
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            ]
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            ]
        },
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            ]
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            "accession": "UNIMOD:170",
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                    "id": "delta_composition",
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                    "id": "delta_avge_mass",
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                {
                    "id": "group_of_poster",
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        },
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            "accession": "UNIMOD:254",
            "name": "Delta:H(2)C(2)",
            "definition": "Acetaldehyde +26.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(2) C(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_3_hidden",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "fatcat"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "26.0373"
                },
                {
                    "id": "spec_4_position",
                    "description": "Any N-term"
                },
                {
                    "id": "group_of_poster",
                    "description": "users"
                },
                {
                    "id": "spec_1_site",
                    "description": "H"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_4_site",
                    "description": "N-term"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_3_position",
                    "description": "Protein N-term"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "26.01565"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_4_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "K"
                },
                {
                    "id": "spec_3_classification",
                    "description": "Other"
                },
                {
                    "id": "record_id",
                    "description": "254"
                },
                {
                    "id": "spec_3_site",
                    "description": "N-term"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_4_group",
                    "description": "4"
                },
                {
                    "id": "spec_4_classification",
                    "description": "Other"
                },
                {
                    "id": "date_time_posted",
                    "description": "2004-08-12 20:01:03"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2011-11-21 13:14:17"
                },
                {
                    "id": "spec_3_group",
                    "description": "3"
                }
            ]
        },
        {
            "accession": "UNIMOD:207",
            "name": "Delta:H(2)C(3)",
            "definition": "Acrolein addition +38.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(2) C(3)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "fatcat"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "38.048"
                },
                {
                    "id": "group_of_poster",
                    "description": "users"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Other"
                },
                {
                    "id": "record_id",
                    "description": "207"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "38.01565"
                },
                {
                    "id": "date_time_posted",
                    "description": "2004-05-06 18:57:08"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-10-15 18:30:31"
                }
            ]
        },
        {
            "accession": "UNIMOD:319",
            "name": "Delta:H(2)C(3)O(1)",
            "definition": "MDA adduct +54.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(2) C(3) O"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_2_misc_notes",
                    "description": "5-hydro-5-methylimidazol-4-one, Methylglyoxal adduct"
                },
                {
                    "id": "username_of_poster",
                    "description": "rkupfer"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "54.0474"
                },
                {
                    "id": "group_of_poster",
                    "description": "users"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "54.010565"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "R"
                },
                {
                    "id": "spec_1_misc_notes",
                    "description": "Malondialdehyde (MDA) adduct"
                },
                {
                    "id": "record_id",
                    "description": "319"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2005-05-12 22:12:10"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-10-16 10:15:34"
                }
            ]
        },
        {
            "accession": "UNIMOD:318",
            "name": "Delta:H(2)C(5)",
            "definition": "MDA adduct +62.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(2) C(5)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "rkupfer"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "62.0694"
                },
                {
                    "id": "group_of_poster",
                    "description": "users"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "318"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "62.01565"
                },
                {
                    "id": "date_time_posted",
                    "description": "2005-05-12 22:00:21"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-10-16 10:29:55"
                }
            ]
        },
        {
            "accession": "UNIMOD:255",
            "name": "Delta:H(4)C(2)",
            "definition": "Acetaldehyde +28.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(4) C(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_3_hidden",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "fatcat"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "28.0532"
                },
                {
                    "id": "group_of_poster",
                    "description": "users"
                },
                {
                    "id": "spec_1_site",
                    "description": "H"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_3_position",
                    "description": "Any N-term"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "28.0313"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "K"
                },
                {
                    "id": "spec_3_classification",
                    "description": "Other"
                },
                {
                    "id": "record_id",
                    "description": "255"
                },
                {
                    "id": "spec_3_site",
                    "description": "N-term"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2004-08-12 20:02:38"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2011-11-21 13:14:58"
                },
                {
                    "id": "spec_3_group",
                    "description": "3"
                }
            ]
        },
        {
            "accession": "UNIMOD:327",
            "name": "Delta:H(4)C(2)O(-1)S(1)",
            "definition": "S-Ethylcystine from Serine.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(4) C(2) O(-1) S"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "UCDMSF"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "44.1188"
                },
                {
                    "id": "group_of_poster",
                    "description": "users"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "S"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "327"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "44.008456"
                },
                {
                    "id": "date_time_posted",
                    "description": "2005-06-20 20:09:02"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-10-16 10:00:57"
                }
            ]
        },
        {
            "accession": "UNIMOD:256",
            "name": "Delta:H(4)C(3)",
            "definition": "Propionaldehyde +40.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(4) C(3)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_3_hidden",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "fatcat"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "40.0639"
                },
                {
                    "id": "group_of_poster",
                    "description": "users"
                },
                {
                    "id": "spec_1_site",
                    "description": "H"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_3_position",
                    "description": "Protein N-term"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "40.0313"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "K"
                },
                {
                    "id": "spec_3_classification",
                    "description": "Other"
                },
                {
                    "id": "record_id",
                    "description": "256"
                },
                {
                    "id": "spec_3_site",
                    "description": "N-term"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2004-08-12 20:04:01"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2010-02-25 10:49:55"
                },
                {
                    "id": "spec_3_group",
                    "description": "3"
                }
            ]
        },
        {
            "accession": "UNIMOD:206",
            "name": "Delta:H(4)C(3)O(1)",
            "definition": "Acrolein addition +56.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(4) C(3) O"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_3_hidden",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "fatcat"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "56.0633"
                },
                {
                    "id": "spec_4_position",
                    "description": "Anywhere"
                },
                {
                    "id": "group_of_poster",
                    "description": "users"
                },
                {
                    "id": "spec_1_site",
                    "description": "C"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_4_site",
                    "description": "R"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_3_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "56.026215"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_4_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "H"
                },
                {
                    "id": "spec_3_classification",
                    "description": "Other"
                },
                {
                    "id": "record_id",
                    "description": "206"
                },
                {
                    "id": "spec_3_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_4_group",
                    "description": "4"
                },
                {
                    "id": "spec_4_classification",
                    "description": "Artefact"
                },
                {
                    "id": "date_time_posted",
                    "description": "2004-05-06 18:55:58"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2017-11-08 16:29:48"
                },
                {
                    "id": "spec_3_group",
                    "description": "3"
                }
            ]
        },
        {
            "accession": "UNIMOD:1926",
            "name": "Delta:H(4)C(3)O(2)",
            "definition": "Methylglyoxal-derived carboxyethyllysine.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(4) C(3) O(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "72.0627"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Artefact"
                },
                {
                    "id": "spec_1_misc_notes",
                    "description": "Note that Table 3 in the reference has the delta as H(3) C(3) O(2) = 71 Da"
                },
                {
                    "id": "record_id",
                    "description": "1926"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "72.021129"
                },
                {
                    "id": "date_time_posted",
                    "description": "2017-11-08 16:41:02"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2021-06-30 11:32:08"
                }
            ]
        }
    ]
}