3H-pyrazol-3-one, 2,4-dihydro-4-[(E)-(4-methylphenyl)azo]-5-(trifluoromethyl)- 4-[(E)-(4-methylphenyl)diazenyl]-5-(trifluoromethyl)-2,4-dihydro-3H-pyrazol-3-one 4-p-Tolylazo-5-trifluormethyl-2,4-dihydropyrazol-3-one InChI=1/C11H9F3N4O/c1-6-2-4-7(5-3-6)15-16-8-9(11(12,13)14)17-18-10(8)19/h2-5,8H,1H3,(H,18,19)/b16-15