preferred_name: methyl 8-{[alpha-L-fucosyl-(1->2)-beta-D-galactosyl-(1->3)-N-acetyl-beta-D-glucosaminyl]oxy}nonanoate + GDP-beta-L-fucose => methyl 8-{[alpha-L-fucosyl-(1->2)-beta-D-galactosyl-(1->3)-[alpha-L-fucosyl-(1->4)]-N-acetyl-beta-D-glucosaminyl]oxy}nonanoate + GDP + H(+)