[
  {
    "molid": "mol27895",
    "smiles": "O=[N+]([O-])C(c1ccccc1)[N+](=O)[O-]",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "O=[N+]([O-])C(c1ccccc1)[N+](=O)[O-]",
        "std_free_energy": -4.133361339569092,
        "relative_population": 1.0
      },
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=[N+]([O-])[C-](c1ccccc1)[N+](=O)[O-]",
        "std_free_energy": -6.3583831787109375,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 3.71,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "AttenGpKa training set"
      }
    ]
  }
]