[
  {
    "molid": "mol33520",
    "smiles": "CN(CCN(C)CC[N+](C)C)CC[N+](C)C",
    "microspecies": [],
    "macro_pka_values": [
      {
        "pka_value": 5.1,
        "charge_state_pre": 4,
        "charge_state_post": 3,
        "data_source": "OCHEM"
      }
    ]
  }
]