preferred_name: alpha-L-rhamnosyl-(1->3)-alpha-D-galactosyl-1-diphospho-di-trans,octa-cis-undecaprenol + GDP-alpha-D-mannose => alpha-D-Man-(1->4)-alpha-L-Rha-(1->3)-alpha-D-Gal-di-trans,octa-cis-undecaprenyl diphosphate + GDP + H(+)