[Isolation and identification of two novel polyhydroxylated sterol from Spongia obligue]

Two novel sterols have been isolated from Spongia obligue collected from South China sea and their structure were identified as 24(28)-methylene-1,3,4,11-tetrohydroxycholest-5-en-18-oic acid and 24(28)-methylene-cholestene-5-en-1,3,8,11-tetraol respectively on the basic of the spectral data of MS, IR, 1HNMR and 13CNMR(DEPT).