[
  {
    "molid": "mol19751",
    "smiles": "O=C(O)C(=O)CC(=O)c1ccccc1",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "O=C(O)C(=O)CC(=O)c1ccccc1",
        "std_free_energy": -1.3618378639221191,
        "relative_population": 1.0
      },
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=C([O-])C(=O)CC(=O)c1ccccc1",
        "std_free_energy": -10.546045303344727,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 2.85,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "Baltruschat ChEMBL"
      }
    ]
  }
]