1,7-Naphthalenedisulfonicacid,3,3'-[carbonylbis[imino(1-methyl-1H-pyrrole-4,2-diyl)carbonylimino(1-methyl-1H-pyrrole-4,2-diyl)carbonylimino]]bis-,tetrasodium salt (9CI)
1,7-Naphthalenedisulfonicacid,3,3'-[carbonylbis[imino(1-methyl-1H-pyrrole-4,2-diyl)carbonylimino(1-methyl-1H-pyrrole-4,2-diyl)carbonylimino]]bis-,tetrasodium salt (9CI)