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    "macro_pka_values": [
      {
        "pka_value": 2.58,
        "charge_state_pre": 1,
        "charge_state_post": 0,
        "data_source": "IUPAC digitized pKa"
      },
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        "pka_value": 9.3,
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        "charge_state_post": -3,
        "data_source": "IUPAC digitized pKa"
      },
      {
        "pka_value": 8.0,
        "charge_state_pre": -3,
        "charge_state_post": -4,
        "data_source": "IUPAC digitized pKa"
      },
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        "pka_value": 3.54,
        "charge_state_pre": -1,
        "charge_state_post": -2,
        "data_source": "IUPAC digitized pKa"
      }
    ]
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]