[
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    "microspecies": [
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        "std_free_energy": -11.392522811889648,
        "relative_population": 0.07097766698522977
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    ],
    "macro_pka_values": [
      {
        "pka_value": 3.54999995231628,
        "charge_state_pre": -1,
        "charge_state_post": -2,
        "data_source": "QSARToolbox"
      }
    ]
  }
]