4TMB:
reference: An Engineered Old Yellow Enzyme that Enables Efficient Synthesis of (4R,6R)-Actinol in a One-Pot Reduction System., Horita S, Kataoka M, Kitamura N, Nakagawa T, Miyakawa T, Ohtsuka J, Nagata K, Shimizu S, Tanokura M, Chembiochem. 2015 Feb 9;16(3):440-5. doi: 10.1002/cbic.201402555. Epub 2015 Jan, 14. PMID: 25639703

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