3OEM:
reference: Ligand-specific deactivation time course of GluN1/GluN2D NMDA receptors., Vance KM, Simorowski N, Traynelis SF, Furukawa H, Nat Commun. 2011 Apr;2:294. PMID: 21522138

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