tert-butyl N-[4-(2-cyanoethylamino)butyl]carbamate

tert-butyl N-[4-(diaminomethylideneamino)butyl]carbamate

N-(苄氧羰基)-1,4-丁二胺

tert-butyl N-[4-[(2,5-dioxopyrrolidin-1-yl)oxycarbonylamino]butyl]carbamate