Dragocins A-D, Structurally Intriguing Cytotoxic Metabolites from a Panamanian Marine Cyanobacterium.

Dragocins A-D (1-4) were isolated from a dark-red wooly textured marine cyanobacterium collected in Boca del Drago, Panama. Dragocins A-C (1-3) possessed 2,3-dihydroxypyrrolidine, 1-hydroxy-5- O-Me-benzoyl, and 4'-substituted-β-ribofuranose moieties that connected to form a nine-membered macrocyclic ring. Dragocins A-C are members of a unique hybrid structural class with substitution at the C-4' position of a ribofuranose unit. Of the four new compounds, dragocin A was the most potent cytotoxin to human H-460 lung cancer cells.