6AQF:
reference: Allosteric Coupling of Drug Binding and Intracellular Signaling in the A2A Adenosine Receptor., Eddy MT, Lee MY, Gao ZG, White KL, Didenko T, Horst R, Audet M, Stanczak P, McClary KM, Han GW, Jacobson KA, Stevens RC, Wuthrich K, Cell. 2018 Jan 11;172(1-2):68-80.e12. doi: 10.1016/j.cell.2017.12.004. Epub 2017 , Dec 28. PMID: 29290469

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