Erylosides F 8 , V 1 -V 3 , and W-W 2 - New triterpene oligoglycosides from the Carribean sponge Erylus goffrilleri.

Seven new triterpene glycosides, erylosides F ₈ (1), V ₁ (2), V ₂ (3), V ₃ (4), W (5), W ₁ (6) and W ₂ (7), were isolated from a Carribean sponge Erylus goffrilleri collected from the Carribean Sea near the Arrecife-Seco reef (Cuba). Structures of the glycosides were determined using ¹ H and ¹³ C NMR spectroscopy, including 2D NMR procedures ( ¹ H- ¹ H COSY, ¹ H- ¹³ С HMBC, ¹ H- ¹³ С HSQC and NOESY) and HR ESI mass spectrometry. Erylosides 1 and 4 have 14-carboxy-24,25-dimethyllanost-8(9)-en-3β,25-diol as aglycone whereas glycosides 2, 3, 5, 6 and 7 are 14-carboxy-24-acetoxy-24-methyllanost-8(9)-en-3β-ol glycoconjugates. Cytotoxic activities of the isolated compounds against Ehrlich carcinoma cells and hemolysis were examined and their dependence on eryloside structure was evaluated.
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