Abstract
Several kinds of naturally occurring fernane-type triterpenoids isolated from a Euphorbia genus were tested on the inhibitory effects of DNA Topoisomerases I (Topo I) and II (Topo II) activities. A-ring cleaved 3,4-seco-8 beta H-ferna-4(23),9(11)-dien-3-oic acid and its 3-hydroxyl derivative were found to be selective inhibitors of Topo II activity without the stabilization of a DNA/Topo II cleavable complex.
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