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Method of inhibiting mammalian topoisomerase II and malignant cell growth in mammals, with substituted (S)-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4 ]-benzoxazine(and-benzothiazine)-6-carboxylic acids

US Patent 5308843 · Granted May 3, 1994

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