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        "mass_monoiso": 257.1012,
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        "mass_monoiso": 426.1499,
        "mass_prot": 427.1577,
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        "product_ions": "250",
        "reference_moiety": [
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        "smile": "OC[C@H]1O[C@@H]([n]2cc(CNCCS(O)(=O)=O)c(=O)[nH]c2=O)[C@H](O)[C@@H]1O"
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        "mass_monoiso": 297.1073,
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        "product_ions": "377",
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        "short_name": "nm5s2U",
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        "reference_moiety": [
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        "short_name": "m4Cm",
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        "product_ions": "180",
        "reference_moiety": [
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        "short_name": "m2,2Gm",
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        "smile": "NC(Cc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1)=O"
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        "short_name": "cmnm5s2U",
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        "product_ions": "112",
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        "short_name": "C",
        "smile": "Nc1nc(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)cc1"
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        "short_name": "cmo5U",
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        "short_name": "Um",
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        "mass_monoiso": 321.1073,
        "mass_prot": 322.1151,
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        "new_abbrev": "\u2020",
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        "smile": "Cc1c[n]2c(c3nc[n]([C@@H]4O[C@H](CO)[C@@H](O)[C@H]4O)c3[nH]c2n1)=O"
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        "mass_avg": 267.241,
        "mass_monoiso": 267.0968,
        "mass_prot": 268.1046,
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        "new_abbrev": "A",
        "product_ions": "136",
        "reference_moiety": [
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        "short_name": "A",
        "smile": "Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "mass_avg": 303.335,
        "mass_monoiso": 303.0889,
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        "product_ions": "172/255/273/141",
        "reference_moiety": [
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        "short_name": "mnm5s2U",
        "smile": "CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O"
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        "new_abbrev": "\u2220",
        "product_ions": "194",
        "reference_moiety": [
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        ],
        "short_name": "m2,2,7G",
        "smile": "CN(c1nc(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)c[n+]2C)n1)C"
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        "lc_elution_time": "",
        "mass_avg": 450.446,
        "mass_monoiso": 450.1863,
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        "new_abbrev": "\u21d1",
        "product_ions": "319",
        "reference_moiety": [
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        "short_name": "yW-58",
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        "mass_avg": 268.226,
        "mass_monoiso": 268.0808,
        "mass_prot": 269.0886,
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        "product_ions": "137",
        "reference_moiety": [
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        "short_name": "I",
        "smile": "OC[C@@H]1[C@@H](O)[C@@H](O)[C@H]([n]2c3nc[nH]c(=O)c3nc2)O1"
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        "lc_elution_time": "",
        "mass_avg": 368.302,
        "mass_monoiso": 368.108,
        "mass_prot": 369.1158,
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        "new_abbrev": "\u2261",
        "product_ions": "237",
        "reference_moiety": [
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        "short_name": "g6A",
        "smile": "OC(CNC(Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)=O"
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        "mass_monoiso": 273.0961,
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        "short_name": "nm5U",
        "smile": "NCc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
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        "mass_avg": 297.267,
        "mass_monoiso": 299.123,
        "mass_prot": 298.1151,
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        "new_abbrev": "7",
        "product_ions": "166",
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        "short_name": "m7G",
        "smile": "[C@@H]1([n]2c[n+](C)c3c2nc(nc3=O)N)O[C@H](CO)[C@@H](O)[C@H]1O"
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        "mass_avg": 274.294,
        "mass_monoiso": 274.0623,
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        "product_ions": "129",
        "reference_moiety": [
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        "short_name": "s2Um",
        "smile": "CO[C@H]1[C@H]([n]2ccc(=O)[nH]c2=S)O[C@H](CO)[C@H]1O"
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        "mass_avg": 244.201,
        "mass_monoiso": 244.0695,
        "mass_prot": 245.0773,
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        "new_abbrev": "P",
        "product_ions": "209/179/155",
        "reference_moiety": [
            "U"
        ],
        "short_name": "Y",
        "smile": "OC[C@H]1O[C@@H](c2c[nH]c(=O)[nH]c2=O)[C@H](O)[C@@H]1O"
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        "formula": "C10H15N3O6",
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        "mass_avg": 273.243,
        "mass_monoiso": 273.0961,
        "mass_prot": 274.1039,
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        "new_abbrev": "\u01a2",
        "product_ions": "142",
        "reference_moiety": [
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        "short_name": "hm5C",
        "smile": "Nc1nc(=O)[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)cc1CO"
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        "new_abbrev": "\u03c6",
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        "reference_moiety": [
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        "short_name": "preQ0",
        "smile": "Nc1[nH]c(=O)c2c(c[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c2n1)C#N"
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        "mass_monoiso": 540.1816,
        "mass_prot": 541.1894,
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        "new_abbrev": "W",
        "product_ions": "409",
        "reference_moiety": [
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        "short_name": "o2yW",
        "smile": "C[n]1c2c(nc[n]2[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[n]2c1nc(C)c2CC(OO)C(NC(OC)=O)C(OC)=O"
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        "lc_elution_time": "",
        "mass_avg": 272.255,
        "mass_monoiso": 272.1008,
        "mass_prot": 273.1086,
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        "new_abbrev": "\u0126",
        "product_ions": "127",
        "reference_moiety": [
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        "short_name": "m5Um",
        "smile": "CO[C@H]1[C@H]([n]2c(=O)[nH]c(=O)c(C)c2)O[C@H](CO)[C@H]1O"
    },
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        "formula": "C12H17N5O5",
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        "mass_avg": 311.294,
        "mass_monoiso": 311.123,
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        "new_abbrev": "\u2209",
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        "reference_moiety": [
            "G"
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        "short_name": "preQ1",
        "smile": "Nc1[nH]c(=O)c2c(CN)c[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c2n1"
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        "new_abbrev": "\u03b7",
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        "reference_moiety": [
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        "short_name": "m6,6Am",
        "smile": "CN(C)c1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1OC"
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        "mass_monoiso": 309.1073,
        "mass_prot": 310.1151,
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        "new_abbrev": "\u21d3",
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        "reference_moiety": [
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        "short_name": "ac6A",
        "smile": "CC(Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O"
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        "formula": "C16H23N5O5S",
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        "mass_avg": 397.449,
        "mass_monoiso": 397.142,
        "mass_prot": 398.1498,
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        "product_ions": "266",
        "reference_moiety": [
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        "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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        "formula": "C11H15N5O4",
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        "mass_monoiso": 281.1124,
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        "short_name": "Am",
        "smile": "CO[C@H]1[C@H]([n]2cnc3c2ncnc3N)O[C@H](CO)[C@H]1O"
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        "mass_monoiso": 282.0964,
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        "new_abbrev": "\u0428",
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        "reference_moiety": [
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        "short_name": "Im",
        "smile": "CO[C@H]1[C@H]([n]2cnc3c2nc[nH]c3=O)O[C@H](CO)[C@H]1O"
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        "formula": "C11H17N3O6",
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        "product_ions": "156/239/257/125/209",
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        "short_name": "mnm5U",
        "smile": "CNCc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
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        "formula": "C15H21N7O7",
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        "mass_monoiso": 412.1343,
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        "new_abbrev": "6",
        "product_ions": "281",
        "reference_moiety": [
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        "short_name": "t6A",
        "smile": "CC(O)C(N)C(NC(Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)=O"
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        "mass_avg": 281.268,
        "mass_monoiso": 281.1124,
        "mass_prot": 282.1202,
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        "new_abbrev": "\u00e2",
        "product_ions": "150",
        "reference_moiety": [
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        "short_name": "m8A",
        "smile": "Cc1nc2c(N)ncnc2[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "formula": "C16H23N5O17P3",
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        "lc_elution_time": "",
        "mass_avg": 650.298,
        "mass_monoiso": 455.0243,
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            "U",
            "C",
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        "mass_monoiso": 469.04,
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        "reference_moiety": [
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            "C",
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        "short_name": "m2,7GpppN",
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            "G"
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        "short_name": "m2,2,7GpppN",
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            "G"
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        "short_name": "mpppN",
        "smile": "COP([O-])(OP([O-])(OP([O-])(OC[C@H]1O[C@@H]%91[C@H](O)[C@@H]1O)=O)=O)=O.[*]%91"
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        "mass_avg": 295.294,
        "mass_monoiso": 295.1281,
        "mass_prot": 296.1358,
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        "reference_moiety": [
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        "smile": "Cc1nc2c(N)nc(C)nc2[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "mass_monoiso": 347.1329,
        "mass_prot": 348.1407,
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        "product_ions": "216",
        "reference_moiety": [
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        "short_name": "acp3D",
        "smile": "NC(CCN1C(=O)N([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)CCC1=O)C(O)=O"
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        "mass_prot": 346.125,
        "name": "3-(3-amino-3-carboxypropyl)pseudouridine",
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        "reference_moiety": [
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        "short_name": "acp3Y",
        "smile": "NC(C(=O)O)CC[n]1c(=O)c([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c[nH]c1=O"
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        "mass_avg": 335.315,
        "mass_monoiso": 335.123,
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        "new_abbrev": "\u20ac",
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        "short_name": "imG",
        "smile": "C[n]1c2c(nc[n]2[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[n]2cc(C)nc12"
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        "short_name": "pac6A",
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        "name": "[(2R,3S,5S)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyldihydrogenphosphate",
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        "short_name": "P1T",
        "smile": "Cc2cn([C@@H]1C[C@H](O)[C@@H](COP(=O)(O)O)O1)c(=O)[nH]c2=O"
    },
    "454": {
        "formula": "C9H12N5O5P",
        "id": 454,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": null,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "[(2R,3S,5R)-5-(6-amino-8-deuteriopurin-9-yl)-3-hydroxyoxolan-2-yl]phosphonicacid",
        "new_abbrev": "\u4ece",
        "product_ions": "",
        "reference_moiety": [
            "A"
        ],
        "short_name": "2HA",
        "smile": "[2H]c2nc1c(N)ncnc1n2[C@H]3C[C@H](O)[C@@H](P(=O)(O)O)O3"
    },
    "455": {
        "formula": "",
        "id": 455,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": null,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "[(2R,3S,5S)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy-N-(2-methoxyethyl)phosphonamidicacid",
        "new_abbrev": "\u4e78",
        "product_ions": "",
        "reference_moiety": [
            "U"
        ],
        "short_name": "MU2",
        "smile": "COCCNP(=O)(O)OC[C@H]2O[C@H](n1cc(C)c(=O)[nH]c1=O)C[C@@H]2O"
    },
    "456": {
        "formula": "C13H22N3O7P",
        "id": 456,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": null,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "[(2R,3S,5S)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy-N-propylphosphonamidicacid",
        "new_abbrev": "\u4eb1",
        "product_ions": "",
        "reference_moiety": [
            "U"
        ],
        "short_name": "MU3",
        "smile": "CCCNP(=O)(O)OC[C@H]2O[C@H](n1cc(C)c(=O)[nH]c1=O)C[C@@H]2O"
    },
    "457": {
        "formula": "C14H24N3O9P",
        "id": 457,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": null,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "N-(2,2-dimethoxyethyl)-[[(2R,3S,5S)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy]phosphonamidicacid",
        "new_abbrev": "\u4f68",
        "product_ions": "",
        "reference_moiety": [
            "U"
        ],
        "short_name": "MU4",
        "smile": "COC(CNP(=O)(O)OC[C@H]2O[C@H](n1cc(C)c(=O)[nH]c1=O)C[C@@H]2O)OC"
    },
    "458": {
        "formula": "C9H12N5O6P",
        "id": 458,
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": null,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "[(2R,3S,5R)-5-(6-amino-8-deuteriopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]phosphonicacid",
        "new_abbrev": "\u4e83",
        "product_ions": "",
        "reference_moiety": [
            "A"
        ],
        "short_name": "AD2",
        "smile": "[2H]c2nc1c(N)ncnc1n2[C@@H]3O[C@H](P(=O)(O)O)[C@@H](O)C3O"
    }
}