1WVR:
reference: Crystal structure of a CRISP family Ca2+ -channel blocker derived from snake venom., Shikamoto Y, Suto K, Yamazaki Y, Morita T, Mizuno H, J Mol Biol. 2005 Jul 22;350(4):735-43. PMID: 15953617

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