1',2'-Dihydro-6'-hydroxy-3,4'-dimethyl-2'-oxo-5'-((4-(phenylazo)phenyl)azo)-1,3'-bipyridinium chloride 1,3'-Bipyridinium, 1',2'-dihydro-6'-hydroxy-3,4'-dimethyl-2'-oxo-5'-((4-(phenylazo)phenyl)azo)-, chloride 3-Methyl-1-(1,2-dihydro-6-hydroxy-4-methyl-2-oxo-5-((4-(phenyl azo)phenyl)azo)pyridin-3-yl)pyridinium chloride 75199-20-1 EINECS 278-119-4