[2,6′-Bibenzothiazole]-7-sulfonic acid, 2′-[4-[2-(1-hydroxy-4-sulfo-2-naphthalenyl)diazenyl]phenyl]-6-methyl-, sodium salt (1:2)HCID 177843712CAS 5915-58-2 · C31H18N4Na2O7S4
