N-Acetylglucosaminyldiphosphodolichol N-Acetylglucosaminyltransferase Activity

UDP-N-Acetyl-D-Glucosamine:N-Acetyl-D-Glucosaminyl-Diphosphodolichol N-Acetyl-D-Glucosaminyltransferase Activity

Catalysis of the reaction: UDP-N-acetyl-D-glucosamine + N-acetyl-D-glucosaminyl-diphosphodolichol = UDP + N,N''-diacetylchitobiosyldiphosphodolichol.