a 1,2-diacyl-3-O-(beta-D-glucopyranosyl)-sn-glycerol = a 1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol
a 1,2-diacyl-3-o-(beta-d-glucopyranosyl)-sn-glycerol = a 1,2-diacyl-3-o-(beta-d-galactosyl)-sn-glycerol