[
  {
    "molid": "mol9901",
    "smiles": "O=[N+]([O-])c1ccccc1OP(=O)(O)O",
    "microspecies": [
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=[N+]([O-])c1ccccc1OP(=O)([O-])O",
        "std_free_energy": -13.31702995300293,
        "relative_population": 1.0
      },
      {
        "id": "-2_1",
        "charge": -2,
        "smiles": "O=[N+]([O-])c1ccccc1OP(=O)([O-])[O-]",
        "std_free_energy": -13.794228553771973,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 5.6,
        "charge_state_pre": -1,
        "charge_state_post": -2,
        "data_source": "IUPAC digitized pKa"
      }
    ]
  }
]