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Isolation and stereospecific synthesis of janolusimide B from a New Zealand collection of the bryozoan Bugula flabellata.

NMR-directed screening of New Zealand marine organisms has led to the isolation of the modified tripeptide janolusimide B from the common invasive bryozoan Bugula flabellata. The structure was established by NMR and MS analysis, degradative hydrolysis and derivatization, and stereoselective fragment synthesis. The bryozoan natural product is an N-methyl analogue of janolusimide, previously reported from the Mediterranean nudibranch Janolus cristatus, a species known to prey upon bryozoa.