sodium 3-[[4-[(4-hydroxyphenyl)azo]-1-naphthyl]azo]benzenesulphonate

3-[[4-[(4-Hydroxyphenyl)azo]-1-naphthalenyl]azo]benzenesulfonic acid sodium salt

Benzenesulfonic acid, 3-4-(4-hydroxyphenyl)azo-1-naphthalenylazo-, monosodium salt