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