[
  {
    "molid": "mol4466",
    "smiles": "O=[N+]([O-])c1cccc2cccnc12",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "O=[N+]([O-])c1cccc2cccnc12",
        "std_free_energy": -6.933997631072998,
        "relative_population": 1.0
      },
      {
        "id": "1_1",
        "charge": 1,
        "smiles": "O=[N+]([O-])c1cccc2ccc[nH+]c12",
        "std_free_energy": 2.943241596221924,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 2.55,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "IUPAC digitized pKa"
      },
      {
        "pka_value": 2.59,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "AttenGpKa training set"
      }
    ]
  }
]