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This article described synthesis and biological activity of combretastatin A-4 (CA-4) and its analogues. Combretastatin A-4 (CA-4), a natural product isolated from the South African bush willow tree Combretum caffrum, binds to the colchicine binding site and inhibits the polymerization of microtubules. CA-4 exhibits potent cytotoxicity against a variety of human cancer cell lines including multidrug-resistant...