Abstract
Two new theonellapeptolide-related cyclic depsipeptides ( 1 and 2) have been isolated from an Okinawan marine sponge Theonella sp. and the structures were elucidated on the basis of the 2D NMR data, PSD analysis of MALDI-TOFMS, and chemical means. Compound 1 was a theonellapeptolide congener possessing a methylsulfinylacetyl group at the N-terminus, while 2 was another theonellapeptolide congener having an acetyl group at the N-terminus. Compounds 1 and 2 exhibited antimicrobial activity.
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