5WGD:
reference: A "cross-stitched" peptide with improved helicity and proteolytic stability., Speltz TE, Mayne CG, Fanning SW, Siddiqui Z, Tajkhorshid E, Greene GL, Moore TW, Org Biomol Chem. 2018 May 23;16(20):3702-3706. doi: 10.1039/c8ob00790j. PMID: 29725689

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