4RLL:
reference: Protein kinase CK2 inhibition is associated with the destabilization of HIF-1alpha in human cancer cells., Guerra B, Rasmussen TD, Schnitzler A, Jensen HH, Boldyreff BS, Miyata Y, Marcussen N, Niefind K, Issinger OG, Cancer Lett. 2015 Jan 28;356(2 Pt B):751-61. doi: 10.1016/j.canlet.2014.10.026., Epub 2014 Oct 28. PMID: 25449433

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