4KFQ:
reference: Crystal structure and pharmacological characterization of a novel N-methyl-D-aspartate (NMDA) receptor antagonist at the GluN1 glycine binding site., Kvist T, Steffensen TB, Greenwood JR, Mehrzad Tabrizi F, Hansen KB, Gajhede M, Pickering DS, Traynelis SF, Kastrup JS, Brauner-Osborne H, J Biol Chem. 2013 Nov 15;288(46):33124-35. doi: 10.1074/jbc.M113.480210. Epub, 2013 Sep 26. PMID: 24072709

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