4BDQ:
reference: Correlating efficacy and desensitization with GluK2 ligand-binding domain movements., Nayeem N, Mayans O, Green T, Open Biol. 2013 May 29;3(5):130051. doi: 10.1098/rsob.130051. PMID: 23720540

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