[
  {
    "molid": "mol38571",
    "smiles": "CCCCOC(=O)C=CC(=O)O",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "CCCCOC(=O)C=CC(=O)O",
        "std_free_energy": -2.8559815883636475,
        "relative_population": 1.0
      },
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "CCCCOC(=O)C=CC(=O)[O-]",
        "std_free_energy": -9.52651596069336,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 4.63000011444092,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "QSARToolbox"
      }
    ]
  }
]