2,2'-(1,4-Phenylenebis(imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(8-hydroxy-3,6-disulphonaphthalene-1,7-diyl)azo))bisnaphthalene-1,5-disulphonic acid 93858-30-1 EINECS 299-262-9