5WF5:
reference: Structural Connection between Activation Microswitch and Allosteric Sodium Site in GPCR Signaling., White KL, Eddy MT, Gao ZG, Han GW, Lian T, Deary A, Patel N, Jacobson KA, Katritch V, Stevens RC, Structure. 2018 Feb 6;26(2):259-269.e5. doi: 10.1016/j.str.2017.12.013. Epub 2018, Jan 27. PMID: 29395784

This OCA Structure page
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