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    "microspecies": [
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        "id": "3_3",
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        "id": "3_4",
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        "id": "4_5",
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    "macro_pka_values": [
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        "pka_value": 7.6,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "OCHEM"
      },
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        "pka_value": 1.3,
        "charge_state_pre": 4,
        "charge_state_post": 3,
        "data_source": "OCHEM"
      },
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        "pka_value": 1.6,
        "charge_state_pre": 4,
        "charge_state_post": 3,
        "data_source": "Baltruschat ChEMBL"
      }
    ]
  }
]