ethyl N-[3-(ethoxycarbonylamino)propyl]carbamate

ethyl N-acetyl-N-(4-aminophenyl)sulfonylcarbamate

ethyl N-butyl-N-[2-(4-methoxy-9H-xanthen-9-yl)ethyl]carbamate

ethyl N-[4-chloro-2-(cyanomethylsulfanyl)phenyl]carbamate

2-Ethyl 1-(2-methyl-2-propanyl) 6-chloro-5-methyl-1H-pyrrolo[2,3- b]pyridine-1,2-dicarboxylate