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A new cytotoxic bromotyrosine-derived secondary metabolite, 11-oxoaerothionin [3], was isolated from the Caribbean sea sponge Aplysina lacunosa. The structure of 3 was argued on the basis of detailed spectroscopic analysis and by chemical conversion to the known antibiotic compound 11-hydroxyaerothionin [2]. When screened against a panel of four human cell lines, 11-oxoaerothionin [3] showed pronounced as well as selective antitumor activity toward the human colon (HCT 116) cell line within the limited concentration range of 0.01-0.1 microgram/ml.
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Acosta et al. (1992) studied this question.
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