(R,S)-N2-[[(diphenylmethyl)amino]carbonyl]-N5-[(phenylmethoxy)carbonyl]-ornithine 、
4-羟基苄胺 在
O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 作用下,
以54%的产率得到(R,S)-N2-[[(diphenylmethyl)amino]carbonyl]-N-[(4-hydroxyphenyl)methyl]-N5-[(phenylmethoxy)carbonyl]-ornithinamide