Abstract
| - Two steroids, haliclostanone sulfate (1) andhalistanol sulfate (3), were isolated from aHaliclonasp. marine sponge. The structure of the new compound1 was established based on itsspectroscopic data and the properties of a pentaacetate derivative2. Compound 1 is uniquein that it possesses the rare cis C/D ring junctionprecedented only in marine sterols,contignasterol (4) and xestobergsterols A (5), B(6), and C (7).
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