Reaction catalyzed by alpha-N-acetylneuraminyl-2,3-beta-galactosyl-1,3-N-acetylgalactosaminide 6-alpha-sialyltransferase (2.4.3.7)

		+			=			+
	CMP-N-acetylneuraminate	+		monosialylgalactosylgloboside	=		CMP	+		disialylgalactosylgloboside