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Two novel triterpenoids, aplysiols A (5) and B (6), have been isolated, together with structurally related known metabolites, from a South China Sea collection of the anaspidean mollusc Aplysia dactylomela. The structures of 5 and 6 were determined mainly by spectroscopic NMR techniques. The absolute stereochemistry of compound 5 was deduced by Mosher's method as well as by biogenetical consideration,...
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