2PYR:
reference: Energy transduction on the nanosecond time scale: early structural events in a xanthopsin photocycle., Perman B, Srajer V, Ren Z, Teng T, Pradervand C, Ursby T, Bourgeois D, Schotte F, Wulff M, Kort R, Hellingwerf K, Moffat K, Science 1998 Mar 20;279(5358):1946-50. PMID: 9506946

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