[
  {
    "molid": "mol3984",
    "smiles": "Cn1ccncc1=S",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "Cn1ccncc1=S",
        "std_free_energy": -7.696855545043945,
        "relative_population": 1.0
      },
      {
        "id": "1_1",
        "charge": 1,
        "smiles": "Cn1cc[nH+]cc1=S",
        "std_free_energy": 2.4459707736968994,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": -0.18,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "IUPAC digitized pKa"
      }
    ]
  }
]