[
  {
    "molid": "mol9863",
    "smiles": "O=C1C=CC(=NO)C(Br)=C1",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "O=C1C=CC(=NO)C(Br)=C1",
        "std_free_energy": -4.870382308959961,
        "relative_population": 1.0
      },
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=C1C=CC(=N[O-])C(Br)=C1",
        "std_free_energy": -4.843721389770508,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 5.7,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "IUPAC digitized pKa"
      }
    ]
  }
]