[
  {
    "molid": "mol1887",
    "smiles": "O=C(O)CC(=O)O",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "O=C(O)CC(=O)O",
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        "relative_population": 1.0
      },
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        "id": "-1_1",
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        "smiles": "O=C([O-])CC(=O)O",
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        "id": "-2_1",
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        "smiles": "O=C([O-])CC(=O)[O-]",
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      }
    ],
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      },
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        "pka_value": 2.8,
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "pka_value": 2.3,
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        "data_source": "IUPAC digitized pKa"
      },
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        "pka_value": 3.37,
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        "data_source": "IUPAC digitized pKa"
      },
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        "pka_value": 3.3,
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        "data_source": "IUPAC digitized pKa"
      },
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        "pka_value": 2.882,
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "pka_value": 2.851,
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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      {
        "pka_value": 2.85,
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        "data_source": "Organic Oxygen Acids and Nitrogen Bases"
      },
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
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      {
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]