preferred_name: a di-trans,poly-cis-dolichyl diphosphooligosaccharide + H2O <=> an oligosaccharide-(1->4)-N-acetyl-beta-D-glucosamine-(1->4)-N-acetyl-alpha-D-glucosamine 1-phosphate + a di-trans,poly-cis-dolichyl phosphate + 2 H(+)