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    "macro_pka_values": [
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        "pka_value": 6.82,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "IUPAC digitized pKa"
      },
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        "pka_value": 6.8600001335144,
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        "data_source": "QSARToolbox"
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        "pka_value": 6.86,
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        "charge_state_post": 0,
        "data_source": "AttenGpKa training set"
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    ]
  }
]