1-(4-Chlorophenyl)-5-hydroxy-3-methyl-4-((4-(phenylazo)phenyl)azo)pyrazole 3H-Pyrazol-3-one, 2-(4-chlorophenyl)-2,4-dihydro-5-methyl-4-((4-(phenylazo)phenyl)azo)- 72152-86-4