Amazing new alkaloid skeletons from the marine sponge Reniera sarai

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Abstract
Reniera sarai possesses two homologous series of alkaloids, sarains 1-3 and sarains A-C, along with some rela- ted minor metabolites which include isosarain-I (1). We now report the complete structural elucidation of 1, which suppor- ts and further clarifies the previously only partially charac- terized structures of sarains 1-3. X-ray structure of an ace- tate derivative of sarain-A has discovered an amazing new ma- crocyclic alkaloid skeleton. All the sarains have been charac- terized by an extensive use of 2D NMR methods.

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