[
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    "macro_pka_values": [
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        "pka_value": 3.9,
        "charge_state_pre": 1,
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        "data_source": "IUPAC digitized pKa"
      },
      {
        "pka_value": 3.88,
        "charge_state_pre": 1,
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      },
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        "data_source": "OCHEM"
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    ]
  }
]