Lipodiscamides A-C, New Cytotoxic Lipopeptides from Discodermia kiiensis

Lipodiscamides A-C, three new lipodepsipeptides, were characterized from the marine sponge Discodermia kiiensis. These structurally rare cyclic lipodepsipeptides were found to possess an unprecedented dilactone macrocycle and, thus, represent a new family of lipopeptides. They are the only lipopeptides bearing 4S-hydroxy-trans-2-enoate, and non-canonical amino acids, L-3-ureidoalanine (Uda), E-dehydronorvaline (Denor), and D-citrulline (Cit). MTT assays against P388 and HeLa cells revealed the moderate cytotoxicity of all three compounds.