Abstract
Two unprecedented acyl-distributed glyceroglycolipids have been isolated from the nitrogen-fixing cyanobacterium Anabaena flos-aquae f. flos-aquae. The structures were determined as (2'S)-3', 6-O-diacyl-glyceryl β-D-galactopyranoside (1) and (2'R)-2', 6-O-diacyl-glyceryl β-D-galactopyranoside (2) on the basis of physicochemical evidence. The positional distribution of fatty acid residues was elucidated by enzymatic hydrolysis using Rhizopus arrhizus lipase.
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