[
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    "microspecies": [
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        "id": "1_4",
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      {
        "id": "-1_5",
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    "macro_pka_values": [
      {
        "pka_value": 3.95,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "AttenGpKa training set"
      },
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        "pka_value": 3.0,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "AttenGpKa training set"
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    ]
  }
]