Abstract
A novel glyceroglycolipid, (2'S)-3', 6-O-diacyl-glyceryl β-D-galactopyranoside (1), was isolated from the nitrogen-fixing cyanobacterium Anabaena flos-aquae. The chemical structure was elucidated on the basis of spectral properties, and the distribution of fatty acid residues was detemined by enzymatic hydrolysis of 1 using lipase (from Rhizopus arrhizus).