3-[(4-nitrophenyl)carbamoylamino]propanoic acid

1-ethyl-3-(4-nitrophenyl)-1-phenylurea

ethyl 1-[(4-aminophenyl)carbamoyl]-4-phenylpiperidine-4-carboxylate

ethyl 3-(4-nitroanilino)-3-oxopropanoate

N-(对硝基苯)邻苯二甲酰亚胺