异氰酸甲酯 、
3-[2-(Benzylamino)ethyl]-1-[2-[[2-[[(4-methoxyphenyl)methyl-methylcarbamoyl]amino]ethyl-(2-methylpropyl)carbamoyl]amino]ethyl]-1-methylurea 以98%的产率得到1-Benzyl-1-[2-[[2-[[2-[[(4-methoxyphenyl)methyl-methylcarbamoyl]amino]ethyl-(2-methylpropyl)carbamoyl]amino]ethyl-methylcarbamoyl]amino]ethyl]-3-methylurea