Acid black 32 (C.I. 26990)

trisodium 4-hydroxy-5-[(2-hydroxynaphthyl)azo]-3-[(4-sulphonatonaphthyl)azo]naphthalene-2,7-disulphonate

4-Hydroxy-5-[(2-hydroxy-1-naphtyl)azo]-3-[(4-sulfo-1-naphtyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt

2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-(2-hydroxy-1-naphthalenyl)azo-3-(4-sulfo-1-naphthalenyl)azo-, trisodium salt