[
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    "macro_pka_values": [
      {
        "pka_value": 2.98000001907349,
        "charge_state_pre": 1,
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        "data_source": "QSARToolbox"
      },
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        "pka_value": 1.21000003814697,
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        "data_source": "QSARToolbox"
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    ]
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]