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.
