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                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "C"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Non-standard residue"
                },
                {
                    "id": "record_id",
                    "description": "1033"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "172.992127"
                },
                {
                    "id": "date_time_posted",
                    "description": "2011-03-31 18:29:45"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-02-01 14:20:14"
                }
            ]
        },
        {
            "accession": "UNIMOD:1032",
            "name": "2-nitrobenzyl",
            "definition": "Tyrosine caged with 2-nitrobenzyl (ONB).",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(5) C(7) N O(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "BThomas"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "135.1201"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "Y"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "1032"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "135.032028"
                },
                {
                    "id": "date_time_posted",
                    "description": "2011-03-14 10:56:33"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2011-03-18 13:39:54"
                }
            ]
        },
        {
            "accession": "UNIMOD:1031",
            "name": "Biotin:Thermo-88310",
            "definition": "Desthiobiotin modification of lysine.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(16) C(10) N(2) O(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "rbomgard"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "196.2462"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "1031"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "196.121178"
                },
                {
                    "id": "date_time_posted",
                    "description": "2011-03-02 20:33:20"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2015-04-20 16:11:56"
                }
            ]
        },
        {
            "accession": "UNIMOD:1028",
            "name": "Xlink:EGS[115]",
            "definition": "Cleavage product of EGS protein crosslinks by hydroylamine treatment.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(5) C(4) N O(3)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "Kramerh"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "115.0874"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Protein N-term"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "115.026943"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "N-term"
                },
                {
                    "id": "record_id",
                    "description": "1028"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2011-02-25 17:16:45"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2017-08-17 15:10:44"
                }
            ]
        },
        {
            "accession": "UNIMOD:1027",
            "name": "Xlink:DMP[140]",
            "definition": "Water quenched monolink of DMP crosslinker.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(12) C(7) N(2) O"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "Kramerh"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "140.183"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Protein N-term"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "140.094963"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "N-term"
                },
                {
                    "id": "record_id",
                    "description": "1027"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2011-02-25 16:18:13"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2017-08-18 10:17:27"
                }
            ]
        },
        {
            "accession": "UNIMOD:1024",
            "name": "Xlink:SMCC[237]",
            "definition": "Water quenched monolink of SMCC.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(15) C(12) N O(4)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_3_hidden",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "Kramerh"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "237.2518"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "C"
                },
                {
                    "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": "spec_3_position",
                    "description": "Protein N-term"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "237.100108"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "K"
                },
                {
                    "id": "spec_3_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "1024"
                },
                {
                    "id": "spec_3_site",
                    "description": "N-term"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2011-02-07 19:33:39"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2017-09-05 15:09:18"
                },
                {
                    "id": "spec_3_group",
                    "description": "3"
                }
            ]
        }
    ]
}