6CRK:
reference: Development of an antibody fragment that stabilizes GPCR/G-protein complexes., Maeda S, Koehl A, Matile H, Hu H, Hilger D, Schertler GFX, Manglik A, Skiniotis G, Dawson RJP, Kobilka BK, Nat Commun. 2018 Sep 13;9(1):3712. doi: 10.1038/s41467-018-06002-w. PMID: 30213947

This OCA Structure page
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