[
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    "macro_pka_values": [
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        "pka_value": 8.5,
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        "data_source": "IUPAC digitized pKa"
      },
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        "pka_value": 8.74,
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        "data_source": "IUPAC digitized pKa"
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        "data_source": "IUPAC digitized pKa"
      },
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        "data_source": "IUPAC digitized pKa"
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    ]
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]