[
  {
    "molid": "mol11316",
    "smiles": "O=S(=O)(O)c1ccc2c(S(=O)(=O)O)ccc(O)c2c1",
    "microspecies": [
      {
        "id": "-3_1",
        "charge": -3,
        "smiles": "O=S(=O)([O-])c1ccc2c(S(=O)(=O)[O-])ccc([O-])c2c1",
        "std_free_energy": -4.201602935791016,
        "relative_population": 1.0
      },
      {
        "id": "-2_3",
        "charge": -2,
        "smiles": "O=S(=O)([O-])c1ccc2c(S(=O)(=O)[O-])ccc(O)c2c1",
        "std_free_energy": -8.824630737304688,
        "relative_population": 0.9855109267281014
      }
    ],
    "macro_pka_values": [
      {
        "pka_value": 7.6,
        "charge_state_pre": -2,
        "charge_state_post": -3,
        "data_source": "IUPAC digitized pKa"
      }
    ]
  }
]