5ABW:
reference: Neutrophil elastase inhibitors for the treatment of (cardio)pulmonary diseases: Into clinical testing with pre-adaptive pharmacophores., von Nussbaum F, Li VM, Bioorg Med Chem Lett. 2015 Oct 15;25(20):4370-81. doi:, 10.1016/j.bmcl.2015.08.049. Epub 2015 Aug 20. PMID: 26358162

This OCA Structure page
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