preferred_name: N-acetyl-beta-D-mannosaminyl-(1->4)-N-acetyl-alpha-D-glucosaminyl di-trans,octa-cis-undecaprenyl diphosphate + UDP + H(+) => UDP-N-acetyl-alpha-D-mannosamine + N-acetyl-alpha-D-glucosaminyl-di-trans,octa-cis-undecaprenyl diphosphate