4NF5:
reference: Structural insights into competitive antagonism in NMDA receptors., Jespersen A, Tajima N, Fernandez-Cuervo G, Garnier-Amblard EC, Furukawa H, Neuron. 2014 Jan 22;81(2):366-78. doi: 10.1016/j.neuron.2013.11.033. PMID: 24462099

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