Reaction catalyzed by N-acetylglucosaminyldiphosphodolichol N-acetylglucosaminyltransferase (2.4.1.141)

		+			=			+
	UDP-N-acetyl-alpha-D-glucosamine	+		N-acetyl-alpha-D-glucosaminyl-diphosphodolichol	=		UDP	+		N-acetyl-beta-D-glucosaminyl-(1->4)-N-acetyl-alpha-D-glucosaminyl-diphosphodolichol