[
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    "molid": "mol33826",
    "smiles": "NNC(=O)CCCCC(=O)NN",
    "microspecies": [
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    ],
    "macro_pka_values": [
      {
        "pka_value": 2.9300000667572,
        "charge_state_pre": 2,
        "charge_state_post": 1,
        "data_source": "QSARToolbox"
      }
    ]
  }
]