[
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    ],
    "macro_pka_values": [
      {
        "pka_value": 6.29,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "IUPAC digitized pKa"
      },
      {
        "pka_value": 6.3,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "Datawarrior"
      },
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        "pka_value": 6.3000002,
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        "data_source": "OCHEM"
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        "pka_value": 6.30000019073486,
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        "charge_state_post": 0,
        "data_source": "QSARToolbox"
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    ]
  }
]