[
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    "macro_pka_values": [
      {
        "pka_value": 2.40000009536743,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "QSARToolbox"
      },
      {
        "pka_value": 2.4,
        "charge_state_pre": 0,
        "charge_state_post": -1,
        "data_source": "AttenGpKa training set"
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      {
        "pka_value": 4.06,
        "charge_state_pre": -1,
        "charge_state_post": -2,
        "data_source": "AttenGpKa training set"
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        "pka_value": 5.1,
        "charge_state_pre": -2,
        "charge_state_post": -3,
        "data_source": "AttenGpKa training set"
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    ]
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]