1',2'-Dihydro-6'-hydroxy-4'-methyl-2'-oxo-5'-(phenylazo)-1,3'-bipyridinium malate 1,3'-Bipyridinium, 1',2'-dihydro-6'-hydroxy-4'-methyl-2'-oxo-5'-(phenylazo)-, malate 1,3'-Bipyridinium, 1',2'-dihydro-6'-hydroxy-4'-methyl-2'-oxo-5'-(phenylazo)-, salt with hydroxybutanedioic acid (1:1) 68214-59-5 EINECS 269-301-4