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Two new cytotoxic annonaceous acetogenins, annomolin (1) and annocherimolin (2), were isolated from an ethanolic extract of the seeds of Annona cherimolia. Annomolin has a mono-THF ring with one flanking hydroxyl and possesses a 1,2-diol at C-7/8 of the aliphatic chain. Annocherimolin has a mono-THF ring with two flanking hydroxyls and possesses a double bond at C-21/22. Their structures were elucidated by spectral data and chemical derivatization. Compound 1 showed cytotoxic selectivity for the human prostate tumor cell line (PC-3), with a potency of over 10,000 times that of adriamycin. Compound 2 showed cytotoxic potencies about 10,000 times those of adriamycin in the breast (MCF-7) and colon (HT-29) cancer cell lines.
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