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        "mass_prot": 275.0701,
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        "smile": "Cc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O"
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        "mass_monoiso": 327.1001,
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        "short_name": "ms2m6A",
        "smile": "CNc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "mass_avg": 260.267,
        "mass_monoiso": 260.0467,
        "mass_prot": 261.0545,
        "name": "4-thiouridine",
        "new_abbrev": "4",
        "product_ions": "129",
        "reference_moiety": [
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        ],
        "short_name": "s4U",
        "smile": "OC[C@H]1O[C@@H]([n]2ccc(=S)[nH]c2=O)[C@H](O)[C@@H]1O"
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        "lc_elution_time": "",
        "mass_avg": 318.303,
        "mass_monoiso": 318.0522,
        "mass_prot": 319.06,
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        "product_ions": "187/169/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cm5s2U",
        "smile": "OC(Cc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O)=O"
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        "lc_elution_time": "",
        "mass_avg": 289.308,
        "mass_monoiso": 289.0732,
        "mass_prot": 290.081,
        "name": "5-aminomethyl-2-thiouridine",
        "new_abbrev": "\u222b",
        "product_ions": "158",
        "reference_moiety": [
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        ],
        "short_name": "nm5s2U",
        "smile": "NCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O"
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        "lc_elution_time": "",
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        "mass_monoiso": 347.0787,
        "mass_prot": 348.0865,
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        "product_ions": "255/273/141/216/237/225",
        "reference_moiety": [
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        ],
        "short_name": "cmnm5s2U",
        "smile": "OC(CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O)=O"
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        "formula": "C16H23N5O4S",
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        "mass_avg": 381.45,
        "mass_monoiso": 381.1471,
        "mass_prot": 382.1549,
        "name": "2-methylthio-N6-isopentenyladenosine",
        "new_abbrev": "*",
        "product_ions": "250",
        "reference_moiety": [
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        ],
        "short_name": "ms2i6A",
        "smile": "CC(C)=CCNc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "lc_elution_time": "",
        "mass_avg": 394.239,
        "mass_monoiso": 393.0239,
        "mass_prot": 394.0317,
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        "new_abbrev": "\u22a5",
        "product_ions": "262",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cmnm5se2U",
        "smile": "OC(CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=[Se])[nH]c1=O)=O"
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        "id": 55,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 458.446,
        "mass_monoiso": 458.122,
        "mass_prot": 459.1298,
        "name": "2-methylthio-N6-threonylcarbamoyladenosine",
        "new_abbrev": "[",
        "product_ions": "327",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2t6A",
        "smile": "CC(O)C(NC(Nc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)C(O)=O"
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        "formula": "C10H15N3O5Se",
        "id": 62,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 336.203,
        "mass_monoiso": 337.0176,
        "mass_prot": 336.0263,
        "name": "5-aminomethyl-2-selenouridine",
        "new_abbrev": "\u03c0",
        "product_ions": "204",
        "reference_moiety": [
            "U"
        ],
        "short_name": "nm5se2U",
        "smile": "NCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=[Se])[nH]c1=O"
    },
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        "formula": "C12H16N2O7S",
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        "lc_elution_comment": "between A and m6A (Kellner 2014)",
        "lc_elution_time": "1,78 (Kellner 2014)",
        "mass_avg": 332.33,
        "mass_monoiso": 332.0678,
        "mass_prot": 333.0756,
        "name": "5-methoxycarbonylmethyl-2-thiouridine",
        "new_abbrev": "3",
        "product_ions": "201/169/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mcm5s2U",
        "smile": "COC(Cc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O)=O"
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        "formula": "C11H17N3O5Se",
        "id": 78,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 350.23,
        "mass_monoiso": 349.0341,
        "mass_prot": 350.0419,
        "name": "5-methylaminomethyl-2-selenouridine",
        "new_abbrev": "\u2245",
        "product_ions": "218",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mnm5se2U",
        "smile": "CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=[Se])[nH]c1=O"
    },
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        "formula": "C17H24N6O8S",
        "id": 79,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 472.473,
        "mass_monoiso": 472.1376,
        "mass_prot": 473.1454,
        "name": "2-methylthio-N6-hydroxynorvalylcarbamoyladenosine",
        "new_abbrev": "\u2248",
        "product_ions": "341",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2hn6A",
        "smile": "CCC(O)C(NC(Nc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)C(O)=O"
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        "formula": "C12H19N3O8S2",
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        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 397.425,
        "mass_monoiso": 397.0614,
        "mass_prot": 398.0692,
        "name": "5-taurinomethyl-2-thiouridine",
        "new_abbrev": "\u0195",
        "product_ions": "266",
        "reference_moiety": [
            "U"
        ],
        "short_name": "tm5s2U",
        "smile": "OC[C@H]1O[C@@H]([n]2cc(CNCCS(O)(=O)=O)c(=O)[nH]c2=S)[C@H](O)[C@@H]1O"
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        "formula": "C9H13N3O4S",
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        "lc_elution_time": "0,68 (Kellner 2014); 0,86 (Kellner 2014)",
        "mass_avg": 259.282,
        "mass_monoiso": 259.0627,
        "mass_prot": 260.0705,
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        "new_abbrev": "\u02a4",
        "product_ions": "128",
        "reference_moiety": [
            "C"
        ],
        "short_name": "s2C",
        "smile": "Nc1nc(=S)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)cc1"
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        "formula": "C9H12N2O5Se",
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        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 307.162,
        "mass_monoiso": 305.9919,
        "mass_prot": 306.9997,
        "name": "2-selenouridine",
        "new_abbrev": "\u03c9",
        "product_ions": "175",
        "reference_moiety": [
            "U"
        ],
        "short_name": "se2U",
        "smile": "O[C@H]1[C@H]([n]2ccc(=O)[nH]c2=[Se])O[C@H](CO)[C@H]1O"
    },
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        "formula": "C9H12N2O5S",
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        "lc_elution_comment": "between G and A (Kellner 2014)",
        "lc_elution_time": "1,06 (Kellner 2014)",
        "mass_avg": 260.267,
        "mass_monoiso": 260.0467,
        "mass_prot": 261.0545,
        "name": "2-thiouridine",
        "new_abbrev": "2",
        "product_ions": "129",
        "reference_moiety": [
            "U"
        ],
        "short_name": "s2U",
        "smile": "O[C@H]1[C@H]([n]2ccc(=O)[nH]c2=S)O[C@H](CO)[C@H]1O"
    },
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        "formula": "C11H17N3O5S",
        "id": 110,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 303.335,
        "mass_monoiso": 303.0889,
        "mass_prot": 304.0967,
        "name": "5-methylaminomethyl-2-thiouridine",
        "new_abbrev": "S",
        "product_ions": "172/255/273/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mnm5s2U",
        "smile": "CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O"
    },
    "117": {
        "formula": "C10H14N2O5S",
        "id": 117,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 274.294,
        "mass_monoiso": 274.0623,
        "mass_prot": 275.0701,
        "name": "2-thio-2'-O-methyluridine",
        "new_abbrev": "\u220f",
        "product_ions": "129",
        "reference_moiety": [
            "U"
        ],
        "short_name": "s2Um",
        "smile": "CO[C@H]1[C@H]([n]2ccc(=O)[nH]c2=S)O[C@H](CO)[C@H]1O"
    },
    "126": {
        "formula": "C16H23N5O5S",
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        "lc_elution_comment": "after m6A (Kellner 2014)",
        "lc_elution_time": "3,19 (Kellner 2014)",
        "mass_avg": 397.449,
        "mass_monoiso": 397.142,
        "mass_prot": 398.1498,
        "name": "2-methylthio-N6-(cis-hydroxyisopentenyl) adenosine",
        "new_abbrev": "\u2260",
        "product_ions": "266",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2io6A",
        "smile": "CC(CO)=CCNc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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}