Two New Steroid Glycosides from the Far East Starfish Hippasteria kurilensis

Two new steroid glycosides were isolated from the Far East starfish Hippasteria kurilensis collected in the Sea of Okhotsk. They were characterized as (22E,24R)-3-O-(2-O-methyl-beta-D-xylopyranosyl)-24-O-[2-O-methyl-beta-D-xylopyranosyl-(1 -> 5)-alpha-L-arabinofuranosyl]-5 alpha-cholest-22-ene-3 beta,4 beta,6 alpha,7 alpha,8,15 beta,24-heptaol (kurilensoside I) and (24S)-3-O-(2-O-methyl-beta-D-xylopyranosyl)-24-O-(alpha-L-arabinofuranosyl)-5 alpha-cholestane-3 beta,4 beta,6 beta,15 alpha, 24-pentaol (kurilensoside J). In addition, the earlier known glycosides linkosides F and L1, leviusculoside G, forbeside L, desulfated echinasteroside, and granulatoside A were isolated and identified. The structures of the new compounds were established with the help of two-dimentional NMR spectroscopy and mass-spectrometry.