[
  {
    "molid": "mol9531",
    "smiles": "O=C(O)c1occc(=O)c1O",
    "microspecies": [
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=C([O-])c1occc(=O)c1O",
        "std_free_energy": -10.973106384277344,
        "relative_population": 0.9975298090483923
      },
      {
        "id": "-2_1",
        "charge": -2,
        "smiles": "O=C([O-])c1occc(=O)c1[O-]",
        "std_free_energy": -2.147653579711914,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 7.67,
        "charge_state_pre": -1,
        "charge_state_post": -2,
        "data_source": "IUPAC digitized pKa"
      }
    ]
  }
]