[
  {
    "molid": "mol30689",
    "smiles": "O=[N+]([O-])c1cc(S(=O)(=O)O)ccc1O",
    "microspecies": [
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=[N+]([O-])c1cc(S(=O)(=O)[O-])ccc1O",
        "std_free_energy": -6.655385971069336,
        "relative_population": 0.9983086774968465
      },
      {
        "id": "-2_1",
        "charge": -2,
        "smiles": "O=[N+]([O-])c1cc(S(=O)(=O)[O-])ccc1[O-]",
        "std_free_energy": -7.279509544372559,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 6.08,
        "charge_state_pre": -1,
        "charge_state_post": -2,
        "data_source": "AttenGpKa training set"
      }
    ]
  }
]