4GLY:
reference: Bicyclic Peptide Ligands Pulled out of Cysteine-Rich Peptide Libraries., Chen S, Rentero Rebollo I, Buth SA, Morales-Sanfrutos J, Touati J, Leiman PG, Heinis C, J Am Chem Soc. 2013 May 1;135(17):6562-9. doi: 10.1021/ja400461h. Epub 2013 Apr, 17. PMID: 23560397

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