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► Seven new triterpene glycosides were isolated from the sponge
Erylus formosus. ► Three carbohydrate chains for three pairs of hexasaccharide glycosides are new. ► Carbohydrate chains architecture represents chemotaxonomic character for the genus.
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.