4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid CAS NO.90-20-0 M.F:C10H9NO7S2 MW:319.31 Appearance:Colorless crystals 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acidCAS NO.90-20-0M.F:C10H9NO7S2MW:319.31Appearance:Colorless crystalsPurity:90%minUsed for:Dyestuffs 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid/90-20-0