6C4H:
reference: Conformation of methylated GGQ in the Peptidyl Transferase Center during Translation Termination., Zeng F, Jin H, Sci Rep. 2018 Feb 5;8(1):2349. doi: 10.1038/s41598-018-20107-8. PMID: 29403017

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