Seven new beta-carboline-based metabolites, designated as eudistomins Y1-Y7 ( 1- 7), were isolated from a tunicate of the genus Eudistoma collected near Tong-Yeong City, South Sea, Korea. These new metabolites differ from previously isolated marine metabolites due to the presence of a benzoyl group attached to the beta-carboline nucleus at C-1. Eudistomins Y 1-Y 7 were evaluated for their antibacterial activity, and eudistomin Y6 exhibited moderate antibacterial activity against Gram-positive bacteria Staphylococcus epidermis and Bacillus subtilis without cytotoxicity in the MTT assay at 100 microM.
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Wang et al. (2008) studied this question.
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