preferred_name: N(4)-(oligosaccharide-(1->4)-N-acetyl-beta-D-glucosaminyl-(1->4)-N-acetyl-beta-D-glucosaminyl)-L-asparaginyl-[protein] + a di-trans,poly-cis-dolichyl diphosphate + H(+) => a di-trans,poly-cis-dolichyl diphosphooligosaccharide + L-asparaginyl-[protein]