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    "macro_pka_values": [
      {
        "pka_value": 7.6100001335144,
        "charge_state_pre": -3,
        "charge_state_post": -4,
        "data_source": "QSARToolbox"
      },
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        "pka_value": 6.46999979019165,
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        "charge_state_post": -3,
        "data_source": "QSARToolbox"
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    ]
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]