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)