Reaction catalyzed by N-acetylneuraminylgalactosylglucosylceramide beta-1,4-N-acetylgalactosaminyltransferase (2.4.1.165)

		+		alpha1-acid glycoprotein	=			+		N-acetylgalactosaminyl-alpha1-acid glycoprotein
	UDP-N-acetyl-D-galactosamine	+		alpha1-acid glycoprotein	=		UDP	+		N-acetylgalactosaminyl-alpha1-acid glycoprotein