3,6-Bis[2-(2-arsonophenyl)diazenyl]-4,5-dihydroxy-2,7-naphthalenedisulfonic Acid Sodium Salt
3,6-Bis[(2-arsonophenyl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic Acid Disodium Salt
3,6-Bis(2,2'-arsonophenylazo)-4,5-dihydroxy-2,7-naphthalenedisulfonic acid disodium salt