butyl 2-[[3-[[[2-(diethylamino)-5-[(octadecylamino)sulphonyl]phenyl]amino]carbonyl]-4-hydroxy-1-naphthyl]azo]benzoate

2-[[3-[[[2-(Diethylamino)-5-[(octadecylamino)sulfonyl]phenyl]amino]carbonyl]-4-hydroxy-1-naphthalenyl]azo]benzoic acid butyl ester