24 epsilon-Methyl-5 alpha-cholestane-3 beta,5,6 beta,22r,24-pentol 6-acetate: new polyhydroxylated sterol from the soft coral Asterospicularia randalli.

A monoacetylated pentahydroxylated sterol has been isolated from the soft coral Asterospicularia randalli collected at Guam Is. in the Pacific. The unusual feature of this sterol is the presence of a hydroxyl group at C-22. The structure was determined by spectral analyses of the new sterol and several transformation products. Proton-carbon correlated spectra were used to make 13C chemical shift assignments.