n-BuOH fraction obtained from MeOH extracts of Allium monanthum was applied to repeated silica gel column chromatographies to give a glycosylglyceride. The chemical structure of the compound was determined to be 1-O-linolenoyl-2-O-linolenoyl-3-O-$eta$-D-galactopyranosyl-누-glycerol on the basis of NMR data and by the adaptation of chemical methods.