2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-4-hydroxy-3-((3-phosphonophenyl)azo)-, diammonium monosodium salt 5-(Acetylamino)-4-hydroxy-3-((3-phosphonophenyl)azo)-2,7-naphthalenedisulfonic acid, monosodium diammonium salt 70815-24-6