4AMI:
reference: Crystal Structures of a Stabilized beta(1)-Adrenoceptor Bound to the Biased Agonists Bucindolol and Carvedilol., Warne T, Edwards PC, Leslie AG, Tate CG, Structure. 2012 May 9;20(5):841-9. PMID: 22579251

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