The Caribbean sponge Agelas longissima produces large amounts of (2S,3S,4R)‐O‐(β‐D‐galactofuranosyl)‐(1→4)‐(α‐D‐galactopyranosyl)‐(1→1)‐[(R)‐2‐hydroxytetracosylamido]‐1,3,4‐hexadecanetriol (longiside, 1), a glycosphingolipid with an unprecedented carbohydrate moiety containing a galactose unit in the unusual β‐furanose form. The structure of longiside was determined by spectroscopic analysis and chemical degradation.
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Cafieri et al. (1994) studied this question.
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