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Schematic representation of the structures of the investigated leishmanicidal aziridine-2,3-dicarboxylate-based cysteine cathepsin inhibitors 13b and 13e as well as those of 13b-B (biotin-tagged derivative of 13b), bADA, E64, E64d, CA074, CA074ME, and E64d-B (biotin-tagged derivative of E64d).
