1D1E:
reference: Stabilization of the helical structure of Y2-selective analogues of neuropeptide Y by lactam bridges., Yao S, Smith-White MA, Potter EK, Norton RS, J Med Chem 2002 May 23;45(11):2310-8. PMID: 12014969

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