2CBP:
reference: The structure of a phytocyanin, the basic blue protein from cucumber, refined at 1.8 A resolution., Guss JM, Merritt EA, Phizackerley RP, Freeman HC, J Mol Biol 1996 Oct 11;262(5):686-705. PMID: 8876647

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