2HKJ:
reference: Structural basis for topoisomerase VI inhibition by the anti-Hsp90 drug radicicol., Corbett KD, Berger JM, Nucleic Acids Res. 2006;34(15):4269-77. Epub 2006 Aug 18. PMID: 16920739

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