[
  {
    "molid": "mol18545",
    "smiles": "O=C(O)C(=Cc1ccccc1)C(=O)O",
    "microspecies": [
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=C([O-])C(=Cc1ccccc1)C(=O)O",
        "std_free_energy": -10.209514617919922,
        "relative_population": 1.0
      },
      {
        "id": "-2_1",
        "charge": -2,
        "smiles": "O=C([O-])C(=Cc1ccccc1)C(=O)[O-]",
        "std_free_energy": -11.847482681274414,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 3.5,
        "charge_state_pre": -1,
        "charge_state_post": -2,
        "data_source": "Baltruschat ChEMBL"
      }
    ]
  }
]