A chromenone analog as an ATP-competitive, DNA non-intercalative topoisomerase II catalytic inhibitor with preferences toward the alpha isoform

5-Hydroxy-2-phenyl-7-(thiiran-2-ylmethoxy)-4 H -chromen-4-one (compound 52 ) was found as a DNA non-intercalative topo II specific catalytic inhibitor by targeting its ATP-binding domain. Showing changes in interaction with Mg 2+ , it exhibited highly selective properties against the α-isoform with less toxicity, unlike other topo II poisons, such as etoposide. Compound 52 exhibited highly topo IIα-selective properties as an ATP competitive catalytic inhibitor with less toxicity, unlike topo II poisons.