1,3-Naphthalenedisulfonic acid, 7,7'-(carbonylbis(imino(1-methyl-1H-pyrrole-4,2-diyl)carbonylimino(1-methyl-1H-pyrrole-4,2-diyl)carbonylimino))bis-, tetrasodium salt 154788-16-6 7,7'-(Carbonyl-bis(imino-N-methyl-4,2-pyrrolcarbonylimino(N-methyl-4,2-pyrrol)carbonylimino))-bis(1,3-naphthalenedisulfonic acid) Fce 26644 Fce-26644 PNU 145156E