Reaction catalyzed by (N-acetylneuraminyl)-galactosylglucosylceramide N-acetylgalactosaminyltransferase (2.4.1.92)

		+			=			+
	UDP-N-acetyl-D-galactosamine	+		(N-acetylneuraminyl)-D-galactosyl-D-glucosylceramide	=		UDP	+		N-acetyl-D-galactosaminyl-(N-acetylneuraminyl)-D-galactosyl-D-glucosylceramide