5DT6:
reference: Novel Functional Properties of Drosophila CNS Glutamate Receptors., Li Y, Dharkar P, Han TH, Serpe M, Lee CH, Mayer ML, Neuron. 2016 Dec 7;92(5):1036-1048. doi: 10.1016/j.neuron.2016.10.058. Epub 2016 , Nov 23. PMID: 27889096

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