3G6E:
reference: U2504 Determines the Species Specificity of the A-Site Cleft Antibiotics: The Structures of Tiamulin, Homoharringtonine, and Bruceantin Bound to the Ribosome., Gurel G, Blaha G, Moore PB, Steitz TA, J Mol Biol. 2009 Apr 9. PMID: 19362093

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