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        "data_source": "IUPAC digitized pKa"
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        "data_source": "QSARToolbox"
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        "pka_value": 2.0,
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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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]