Abstract
Feroxosides A and B, have been isolated from the polar extract of the Caribbean sponge Ectyoplasia ferox. Their structures have been determined to be unusual C-4 nor-lanostane triterpenes glycosylated with a rhamnose containing tetrasaccharide chain, by interpretation of spectral data and chemical degradation. Absolute stereochemistry at C-23 has been determined by application of the modified Mosher method for secondary alcohols. Feroxosides A-B are moderately cytotoxic (IC 50 19 μg/mL) against murine monocyte-macrophage cell line.
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