[
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    "macro_pka_values": [
      {
        "pka_value": 3.42000007629395,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "QSARToolbox"
      },
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        "pka_value": 1.52999997138977,
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        "charge_state_post": 1,
        "data_source": "QSARToolbox"
      }
    ]
  }
]