1PIF:
reference: Carbohydrate and protein-based inhibitors of porcine pancreatic alpha-amylase: structure analysis and comparison of their binding characteristics., Machius M, Vertesy L, Huber R, Wiegand G, J Mol Biol 1996 Jul 19;260(3):409-21. PMID: 8757803

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).