(1,1'-Biphenyl)-2,2'-disulfonic acid, 4,4'-bis((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-, compd. with N,N'-bis(2-methylphenyl)guanidine (1:2) 4,4'-Bis((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)(1,1'-biphenyl)-2,2'-disulphonic acid, compound with N,N'-bis-o-tolylguanidine (1:2) 72906-54-8 EINECS 277-006-7