[
  {
    "molid": "mol4528",
    "smiles": "Cn1cnc2c([N+](=O)[O-])cccc21",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "Cn1cnc2c([N+](=O)[O-])cccc21",
        "std_free_energy": -7.005708694458008,
        "relative_population": 1.0
      },
      {
        "id": "1_1",
        "charge": 1,
        "smiles": "Cn1c[nH+]c2c([N+](=O)[O-])cccc21",
        "std_free_energy": 2.2306087017059326,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 3.86,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "IUPAC digitized pKa"
      }
    ]
  }
]