[
  {
    "molid": "mol33548",
    "smiles": "CN(CCC[N+](C)C)CCC[N+](C)C",
    "microspecies": [],
    "macro_pka_values": [
      {
        "pka_value": 6.4,
        "charge_state_pre": 3,
        "charge_state_post": 2,
        "data_source": "OCHEM"
      }
    ]
  }
]