[
  {
    "molid": "mol2227",
    "smiles": "O=C(O)c1ccc(O)c(O)c1",
    "microspecies": [
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        "id": "0_1",
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      },
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      },
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        "pka_value": 4.48,
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        "data_source": "Organic Oxygen Acids and Nitrogen Bases"
      },
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        "pka_value": 4.44,
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        "pka_value": 9.0,
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        "pka_value": 8.933333333,
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        "pka_value": 13.1,
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        "pka_value": 11.94,
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      {
        "pka_value": 12.6,
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      {
        "pka_value": 12.5,
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]