1U9H:
reference: Heterocyclic peptide backbone modifications in an alpha-helical coiled coil., Horne WS, Yadav MK, Stout CD, Ghadiri MR, J Am Chem Soc. 2004 Dec 1;126(47):15366-7. PMID: 15563148

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