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    "microspecies": [
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        "id": "2_18",
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        "id": "2_20",
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      {
        "id": "2_21",
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    "macro_pka_values": [
      {
        "pka_value": 3.26,
        "charge_state_pre": 2,
        "charge_state_post": 1,
        "data_source": "AttenGpKa training set"
      }
    ]
  }
]