[
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    "macro_pka_values": [
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        "pka_value": 9.87,
        "charge_state_pre": 1,
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        "data_source": "Datawarrior"
      },
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        "pka_value": 6.64,
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        "data_source": "Datawarrior"
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        "pka_value": 6.6399998664856,
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        "data_source": "QSARToolbox"
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    ]
  }
]