[
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        "id": "-2_1",
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    "macro_pka_values": [
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        "data_source": "Datawarrior"
      },
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        "pka_value": 2.1,
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        "pka_value": 2.0999999,
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        "data_source": "OCHEM"
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        "pka_value": 10.7,
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        "charge_state_post": -2,
        "data_source": "Datawarrior"
      }
    ]
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]