preferred_name: a beta-D-galactosyl-(1->4)-[alpha-L-fucosyl-(1->3)]-N-acetyl-beta-D-6-sulfooxy-glucosaminyl derivative + GDP + H(+) => a beta-D-galactosyl-(1->4)-N-acetyl-beta-D-6-sulfooxy-glucosaminyl derivative + GDP-beta-L-fucose