1QZR:
reference: Structure of the topoisomerase II ATPase region and its mechanism of inhibition by the chemotherapeutic agent ICRF-187., Classen S, Olland S, Berger JM, Proc Natl Acad Sci U S A 2003 Sep 16;100(19):10629-34. Epub 2003 Sep 8. PMID: 12963818

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