2,7-Naphthalenedisulfonicacid,4-[2-[2,4-dihydroxy(hydroxymethyl)-5-[2-[4-[(4-nitro-2-sulfophenyl)amino]phenyl]diazenyl]phenyl]diazenyl]-5-hydroxy-,sodium salt
2,7-Naphthalenedisulfonicacid,4-[2-[2,4-dihydroxy(hydroxymethyl)-5-[2-[4-[(4-nitro-2-sulfophenyl)amino]phenyl]diazenyl]phenyl]diazenyl]-5-hydroxy-,sodium salt