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Two new cytotoxic 26-membered macrolides, amphidinolides B4 (1) and B5 (2), have been isolated from a marine dinoflagellate Amphidinium sp. (strain Y-100), and the structures were elucidated on the basis of detailed analyses of 2D NMR data including 13 C− 13 C correlations. Introduction Amphidinolides are a series of unique cytotoxic macrolides isolated… (More)
Six new cytotoxic bis-3-alkylpyridine alkaloids with an azoxy moiety, pyrinadines B-G (1-6), have been isolated from an Okinawan marine sponge Cribrochalina sp., and the structures were elucidated by spectroscopic data and chemical means.