[
  {
    "molid": "mol37579",
    "smiles": "O=[N+]([O-])c1ccc(O)c([N+](=O)[O-])n1",
    "microspecies": [
      {
        "id": "0_1",
        "charge": 0,
        "smiles": "O=[N+]([O-])c1ccc(O)c([N+](=O)[O-])n1",
        "std_free_energy": -1.6651989221572876,
        "relative_population": 0.9963975691631274
      },
      {
        "id": "-1_1",
        "charge": -1,
        "smiles": "O=[N+]([O-])c1ccc([O-])c([N+](=O)[O-])n1",
        "std_free_energy": -8.37553596496582,
        "relative_population": 1.0
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 3.20000004768372,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "QSARToolbox"
      }
    ]
  }
]