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    "macro_pka_values": [
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        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "Baltruschat ChEMBL"
      },
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        "pka_value": 3.76,
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        "charge_state_post": 0,
        "data_source": "Baltruschat ChEMBL"
      },
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        "data_source": "Baltruschat ChEMBL"
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]