3FGO:
reference: Cyclopiazonic acid is complexed to a divalent metal ion when bound to the sarcoplasmic reticulum Ca2+-ATPase., Laursen M, Bublitz M, Moncoq K, Olesen C, Moeller JV, Young HS, Nissen P, Morth JP, J Biol Chem. 2009 Mar 16. PMID: 19289472

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