preferred_name: alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-alpha-D-Gal-di-trans,octa-cis-undecaprenyl diphosphate + GDP + H(+) => alpha-D-mannosyl-(1->3)-alpha-D-galactosyl-diphospho-di-trans,octa-cis-undecaprenol + GDP-alpha-D-mannose