Chemical studies of marine invertebrates XIX. Glycosidic chain structure of thelothurins A and B, two new saponins from the Indo‐pacific sea cucumber Thelonota ananas Jaeger (Echinodermata)

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Abstract
The Indo‐pacific sea cucumber Thelonota ananas contains two new triterpene saponins, thelothurins A and B. Both have the same glycosidic chain shown to be 3‐0‐methyl‐β‐D‐glucosyl‐(1→4)‐β‐D‐xylosyl‐(1→4)‐β‐D‐glucosyl‐(1→4)‐2‐0‐X‐3‐0‐methyl‐β‐D‐glucosyl‐(1→3'β‐aglycone A or B) (IA/B), where X is an hitherto unidentified substituent.