2,4-Dihydro-5-methyl-4-((4-methyl-2-nitrophenyl)azo)-3H-pyrazol-3-one 3H-Pyrazol-3-one, 2,4-dihydro-5-methyl-4-((4-methyl-2-nitrophenyl)azo)- 6358-49-2 EINECS 228-776-8