1JR0:
reference: Anchor-based design of improved cholera toxin and E. coli heat-labile enterotoxin receptor binding antagonists that display multiple binding modes., Pickens JC, Merritt EA, Ahn M, Verlinde CL, Hol WG, Fan E, Chem Biol 2002 Feb;9(2):215-24. PMID: 11880036

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