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Two new cytotoxic antibiotics, piericidins C7 (1) and C8 (2), were isolated from a marine Streptomyces sp. High-resolution FAB-MS established the molecular formulae of 1 and 2 as C28H41NO5 and C29H43NO5, respectively. The planar structures of the piericidins were elucidated by NMR spectral analysis including COSY, HMQC and HMBC. The relative stereochemistry of 2 was determined based on NOESY and coupling constant analyses. 1 and 2 are new members of the piericidin family possessing 11,12-epoxide and 12-butenyl groups.

Structures of New Cytotoxic Antibiotics, Piericidins C7 and C8