3WQH:
reference: Anagliptin, a potent dipeptidyl peptidase IV inhibitor: its single-crystal structure and enzyme interactions., Watanabe YS, Yasuda Y, Kojima Y, Okada S, Motoyama T, Takahashi R, Oka M, J Enzyme Inhib Med Chem. 2015 Jul 6:1-8. PMID: 26147347

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