Abstract: | Two new steroid glycosides have been isolated from an ethanolic extract of the starfishCrossaster papposus — crossasterosides P1 and P2. On the basis of chemical transformations and spectral characteristics, the structure of crossasteroside P1 has been established as (24R)-24-ethyl-5-cholestane-3,6,8,15,16,29-hexaol 29-O-[2-O-methyl--D-xylopyranosyl-(1 2)--D-galactofuranoside]. Crossasteroside P2 is its 4-hydroxy analogue.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Branch, Academy of Sciences of the USSR, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 669–673, September–October, 1989. |