EINECS 230-648-1

2-Hydroxy-(1,1'-azobisnaphthalene)-4',6,8-trisulfonic acid

6-Hydroxy-5-(4-sulfo-1-naphtylazo)-2,4-naphthalenedisulfonic acid

7-hydroxy-8-[(4-sulphonaphthyl)azo]naphthalene-1,3-disulphonic acid