butyl 4-[[4-[[5-chloro-2-oxo-1-(piperidin-1-ylmethyl)indol-3-ylidene]amino]benzoyl]amino]benzoate

2-(4-butoxycarbonylanilino)acetic acid

2-(4-butoxycarbonyl-N-nitrosoanilino)acetic acid

butyl 4-[(4-phenylphenyl)methylideneamino]benzoate

butyl 4-[(4-nitrobenzoyl)amino]benzoate