5F8U:
reference: Ligand occupancy in crystal structure of beta1-adrenergic G protein-coupled receptor., Leslie AG, Warne T, Tate CG, Nat Struct Mol Biol. 2015 Dec 8;22(12):941-2. doi: 10.1038/nsmb.3130. PMID: 26643842

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