preferred_name: alpha-D-Man-(1->3)-alpha-D-Man-(1->2)-alpha-D-Man-(1->2)-D-Man + UDP-N-acetyl-alpha-D-glucosamine <=> alpha-D-Man-(1->3)-[alpha-D-GlcNAc-(1->2)]-alpha-D-Man-(1->2)-alpha-D-Man-(1->2)-D-Man + UDP + H(+)