Abstract
A new cyclopropane-containing sterol was isolated from the marine sponge Cribrochalina vasculum. The new sterol was characterized by nuclear magnetic resonance and mass spectrometry and the structure was shown to be (23R,24S,28R)-dihydrocalysterol. Implications concerning the biosynthesis of cyclopropane and cyclopropene sterols in sponges are discussed. ( Steroids 57:258–261, 1992)
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