Seven new triterpene glycosides, erylosides R(1) (1), T(1) (3), T(2) (4), T(3) (5), T(4) (6), T(5) (7), and T(6) (8) along with the known formoside (2) were isolated from the sponge Erylus formosus collected along the Caribbean coast of Mexico. Glycoside 1 was determined as a trisaccharide, glycoside 2 as a tetrasaccharide while glycosides 3-8 were hexasaccharide. Their carbohydrate chains were unprecedented and have never been found in oligosaccharides from other biological sources, except Erylus spp. Three carbohydrate chains in the glycosides 3 and 6, 4 and 7, 5 and 8 correspondingly are new. The glycosides 1-5 have penasterol as aglycone while glycosides 6-8 proved to be glycoconjugates of 24-methylene-14-carboxy-lanost-8(9)-en-3β-ol.
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