[
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        "id": "2_5",
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        "id": "2_9",
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    "macro_pka_values": [
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        "pka_value": 2.64,
        "charge_state_pre": 2,
        "charge_state_post": 1,
        "data_source": "Baltruschat ChEMBL"
      }
    ]
  }
]