Bicyclic α,ω-dicarboxylic acid derivatives from a colonial tunicate of the family Polyclinidae
2009
Abstract In the course of our search for bioactive metabolites from a colonial tunicate of the family Polyclinidae, six new ( 1 – 6 ) cyclic fatty acid derivatives were isolated. Their planar structures were established on the basis of NMR and MS spectroscopic analyses. The relative configuration was determined by NOESY experiment. Compounds 1 – 6 represent a fused bicyclic skeleton possibly derived from α,ω-dicarboxylic acids such as eicosanedioic acid or docosanedioic acid via a Diels–Alder type of cyclization. Compounds 1 – 4 and 6 showed mild cytotoxicity against a panel of five human solid tumor cell lines.
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