Diammonium 5-[4-(7-amino-1-hydroxy-3-sulphonato-2-naphthylazo)-1-naphthylazo]-isophthalate

Benzenedicarboxylic acid, 4-(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo-1-naphthalenylazo-, ammonium salt