6C2Y:
reference: Utilizing a structure-based docking approach to develop potent G protein-coupled receptor kinase (GRK) 2 and 5 inhibitors., Waldschmidt HV, Bouley R, Kirchhoff PD, Lee P, Tesmer JJG, Larsen SD, Bioorg Med Chem Lett. 2018 May 15;28(9):1507-1515. doi:, 10.1016/j.bmcl.2018.03.082. Epub 2018 Mar 30. PMID: 29627263

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