[
  {
    "molid": "mol37345",
    "smiles": "O=C(O)C[C](O)C(=O)O",
    "microspecies": [
      {
        "id": "-2_1",
        "charge": -2,
        "smiles": "O=C([O-])C[C](O)C(=O)[O-]",
        "std_free_energy": -14.47763442993164,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 11.0,
        "charge_state_pre": -2,
        "charge_state_post": -3,
        "data_source": "QSARToolbox"
      }
    ]
  }
]