Abstract
Two novel 16-membered tetraene marcolides, bafilomycins N (1) and O (2), along with two known analogues, JBIR-100 (3) and bafilomycin K (4) were produced from isolate GIC10-1, a Streptomyces sp. strain that was originally cloned from bacterial communities associated with marine sponge Theonella sp. The structures of new bafilomycins 1 and 2 were established by using spectroscopic methods and comparing the spectroscopic data with those of known related metabolites. Compounds 1 and 2 were proven to be the first 14-methylbafilomycins to be isolated. Cytotoxicity of these compounds toward various cancer cell lines also is described.
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