Chemical constituents from the Thai marine sponge, Biemna fortis

Abstract

The isolation of bioactive polyether compounds from the methanol extract of Thai marine sponge, Biemna fortis was guided by both tumor cytotoxicity and 1H-NMR signals. Moreover, three diene-unsaturated steroid compounds, brassicasterol, cerevisterol and 22(E)-ergosta-7, 22-dien-3, 5-diol-6-one, were isolated from the same extract. The identification and structure elucidation of the isolated steroids were achieved by analyses of the UV, IR, MS, ID and 20-NMR spectral data.