6WY9:
reference: A Key Glycine in Bacterial Steroid-Degrading Acyl-CoA Dehydrogenases Allows Flavin-Ring Repositioning and Modulates Substrate Side Chain Specificity., Stirling AJ, Gilbert SE, Conner M, Mallette E, Kimber MS, Seah SYK, Biochemistry. 2020 Oct 27;59(42):4081-4092. doi: 10.1021/acs.biochem.0c00568., Epub 2020 Oct 11. PMID: 33040522

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