Reaction catalyzed by beta-glucogallin O-galloyltransferase (2.3.1.90)

		+			=			+
	1-O-4-hydroxybenzoyl-beta-D-glucose	+		1-O-4-hydroxybenzoyl-beta-D-glucose	=		1,2-di-O-benzoyl-beta-D-glucose	+		D-glucose