Abstract
Theonellapeptolide Id is a tridecapeptide containing a 37-membered lactone, originally isolated from the marine sponge Theonella swinhoei. In addition to moderate cytotoxicity, immunosuppressive activity had been reported for this natural cyclodepsipeptide. However, the synthetic material to verify its unique biological activity has not been available thus far. In this study, the first total synthesis of theonellapeptolide Id has been performed by solid phase peptide synthesis, and the biological activity has been confirmed in comparison with cyclosporin A.
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