Abstract

The absolute stereochemistry of saraines A-C ( 2–4), a class of unusual polycyclic alkaloids from the Mediterranean sponge Reniera sarai, has been elucidated by applying high field 1H-NMR to Mosher's method. The structures of saraine-B ( 3) and saraine-C ( 4), only partially clarified previously, now have been fully characterized by extensive analysis of their NMR spectra.

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