3H-Pyrazol-3-one, 4-((2,5-dichlorophenyl)azo)-2,4-dihydro-5-methyl-2-phenyl- 4-((2,5-Dichlorophenyl)azo)-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one 6407-75-6 7538-55-8 EINECS 229-040-9