1PPI:
reference: The active center of a mammalian alpha-amylase. Structure of the complex of a pancreatic alpha-amylase with a carbohydrate inhibitor refined to 2.2-A resolution., Qian M, Haser R, Buisson G, Duee E, Payan F, Biochemistry 1994 May 24;33(20):6284-94. PMID: 8193143

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