5KHM:
reference: Optimization of a Series of Bivalent Triazolopyridazine Based Bromodomain and Extraterminal Inhibitors: The Discovery of (3R)-4-[2-[4-[1-(3-Methoxy-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)-4-piperidyl]phen oxy]ethyl]-1,3-dimethyl-piperazin-2-one (AZD5153)., Bradbury RH, Callis R, Carr GR, Chen H, Clark E, Feron L, Glossop S, Graham MA, Hattersley M, Jones C, Lamont SG, Ouvry G, Patel A, Patel J, Rabow AA, Roberts CA, Stokes S, Stratton N, Walker GE, Ward L, Whalley D, Whittaker D, Wrigley G, Waring MJ, J Med Chem. 2016 Sep 8;59(17):7801-17. doi: 10.1021/acs.jmedchem.6b00070. Epub, 2016 Aug 24. PMID: 27528113

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