Synonyms: Butanoicacid, [[5-(acetylamino)-4-[(2-bromo-4,6-dinitrophenyl)azo]-2-ethoxyphenyl]imino]di-2,1-ethanediylester (9CI); Butyric acid, diester with5'-[bis(2-hydroxyethyl)amino]-2'-[(2-bromo-4,6-dinitrophenyl)azo]-p-acetophenetidide(8CI); p-Acetophenetidide, 5'-[bis(2-hydroxyethyl)amino]-2'-[(2-bromo-4,6-dinitrophenyl)azo]-,dibutyrate (ester) (8CI)