[
  {
    "molid": "mol33915",
    "smiles": "O=C(O)c1cccc(C(=O)O)c1[N+](=O)[O-]",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "O=C(O)c1cccc(C(=O)O)c1[N+](=O)[O-]",
        "std_free_energy": 1.8618431091308594,
        "relative_population": 1.0
      },
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=C([O-])c1cccc(C(=O)O)c1[N+](=O)[O-]",
        "std_free_energy": -8.804962158203125,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 3.00999999046326,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "QSARToolbox"
      }
    ]
  }
]