having A-and B-ring substituents are prepared via semi-synthesis. Most of these compounds are found to exhibit potent anti-cancer activity based on their in vitro cytotoxicity data obtained against human tumor cell lines. -(SUB-RAHMANYAM, DUVVURI; SARMA, VEDULA M.; VENKATESWARLU, AKELLA; SASTRY, THUNGATHURTHI V. R. S.; SRINIVAS, AKELLA S. S. V.; KRISHNA, CHINTAKUNTA V.; DEEVI, DANVANTHRI S.; KUMAR, SANDHUKHAN A.; BABU, MOSES J.; DAMODARAN, NARAYANAN K.; Bioorg. Med.
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