4YGW:
reference: Acetone-Linked Peptides: A Convergent Approach for Peptide Macrocyclization and Labeling., Assem N, Ferreira DJ, Wolan DW, Dawson PE, Angew Chem Int Ed Engl. 2015 Jun 11. doi: 10.1002/anie.201502607. PMID: 26096515

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