M. Jaspars et P. Crews, A TRITERPENE TETRASACCHARIDE, FORMOSIDE, FROM THE CARIBBEAN CHORISTIDA SPONGE ERYLUS-FORMOSUS, Tetrahedron letters, 35(41), 1994, pp. 7501-7504
A new triterpene tetrasaccharide, formoside (1) was isolated in 25% yi
eld from the butanolic extract of the marine sponge Erylus formosus. T
he structure of the aglycone was identical to that of penasterol while
the glycoside was composed of two arabinose and two galactose units w
ith Ara-I as the branch point for Gal-I and the Ara-II-Gal-II unit.