97375-42-3 Benzenesulfonic acid, 2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-4-((4-sulfophenyl)azo)-1H-pyrazol-1-yl)-, compd. with N,N'-di(phenyl, o-tolyl and xylyl)guanidine (2:1) EINECS 306-699-1