Two unprecedented triterpene glycosides, fallaxosides B₁ and D₃ with aglycones of new skeletal types were isolated from the sea cucumber Cucumaria fallax (Cucumariidae, Dendrochirotida). The first of these aglycones is formed as result of intramolecular aldol condensation of a precursor having 1,6-diketone functionality, while the second one by pinacol-pinacolone-like rearrangement of another precursor, probably containing 7,8,9-trihydroxy fragment (or its 8,9-epoxy-7-hydroxy analog). The structures of these compounds were established by analysis of 1D, 2D NMR, ESI MS and CD data with using the quantum-chemical calculations.

中文翻译：

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Fallaxosides B1和D3，三萜糖苷与海参黄瓜角豆苷的新型骨架类型的糖苷配基

从海参Cucumaria fallax（Cucumariidae，Dendrochirotida）中分离出两种前所未有的三萜糖苷，即具有新骨架类型糖苷的fallaxosides B ₁和D ₃。这些糖苷配基中的第一个是分子内醛醇缩合形成的，该分子具有1,6-二酮官能团，而第二个糖苷配基是通过另一种可能含有7,8,9-三羟基片段的前体的频哪醇-品那龙的重排而形成的（或其8,9-环氧-7-羟基类似物）。通过使用量子化学计算对1D，2D NMR，ESI MS和CD数据进行分析，可以确定这些化合物的结构。