preferred_name: 4-O-{[(2R)-1-glycerylphospho](n)-(2R)-1-glycerylphospho}-N-acetyl-beta-D-mannosaminyl-(1->4)-N-acetyl-alpha-D-glucosaminyl undecaprenyl diphosphate + n UDP-alpha-D-glucose => 4-O-{[(2R)-2-alpha-D-glucosyl-1-glycerylphospho](n)-(2R)-1-glycerylphospho}-N-acetyl-beta-D-mannosaminyl-(1->4)-N-acetyl-alpha-D-glucosaminyl undecaprenyl diphosphate + n UDP + n H(+)