3-[(4-anilinophenyl)azo]benzenesulphonic acid

ChEBI: A member of the class of azobenzenes that is azobenzene in which one of the phenyl groups is substituted at the para position by an anilino group, while the other is substituted at a meta position by a sulfo group. The monosodium alt is the biological stain 'metanil yellow'.