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Summary Etoposide (VP-16), a topoisomerase II (Topo II) inhibitor, has been widely used to treat malignancies. Its clinical application, however, has been hindered by the rise of acquired multidrug resistance (MDR). Here, we report that 4β-{[4-(pyrrolidin-1-ylmethyl)phenyl]amino}-4′-O-Demethyl-4-Epipodophyllotoxin (5k), a novel β-O-demethyl-epipodophyllotoxin analogue, possesses higher antitumor activity...
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