3-cyclohexyl-1-[6-[cyclohexylcarbamoyl(nitroso)amino]hexyl]-1-nitrosourea

1-(2-chloroethyl)-3-[6-(2-chloroethylcarbamoylamino)hexyl]urea

pentyl N-[6-(pentoxycarbonylamino)hexyl]carbamate

N-(6-isocyanatohexyl)pentylcarbamate

1,6-二(叔-丁氧羰基氨基)己烷