Synonyms: methyl N-[3-(acetylamino)-4-[(4-nitrophenyl)azo]phenyl]-N-(3-methoxy-3-oxopropyl)-beta-alaninate;.beta.-Alanine, N-3-(acetylamino)-4-(4-nitrophenyl)azophenyl-N-(3-methoxy-3-oxopropyl)-, methyl ester;3,3'-[[3-(Acetylamino)-4-[(4-nitrophenyl)azo] phenyl] imino]bis(propanoic acid), dimethyl ester;n-[3-(acetylamino)-4-[(4-nitrophenyl)azo]phenyl]-n-(3-methoxy-3-beta-alanin;-Alanine, N-[3-(acetylamino)-4-[(4- nitrophenyl)azo]phenyl]-N-(3-methoxy-3-oxopropyl) -, methyl ester;3,3'-[[3-Acetylamino-4-(4-nitrophenylazo)phenyl]imino]dipropionic acid dimethyl ester;2-Acetamido-4-[bis[(2-methoxycarbonyl)ethyl]amino]-4'-nitroazobenzene;C.I. 113386