[
  {
    "molid": "mol38609",
    "smiles": "CCCCC(C(=O)O)C(=O)O",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "CCCCC(C(=O)O)C(=O)O",
        "std_free_energy": -1.54924738407135,
        "relative_population": 1.0
      },
      {
        "id": "-1_2",
        "charge": -1,
        "smiles": "CCCCC(C(=O)[O-])C(=O)O",
        "std_free_energy": -10.03031063079834,
        "relative_population": 0.9986238397198175
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 2.96000003814697,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "QSARToolbox"
      }
    ]
  }
]