2-Pyrazolin-5-one, 3-ethoxy-1-(p-nitrophenyl)- 3H-Pyrazol-3-one, 5-ethoxy-2,4-dihydro-2-(4-(nitrophenyl))- 3H-Pyrazol-3-one, 5-ethoxy-2,4-dihydro-2-(4-nitrophenyl)- 4105-90-2 5-Ethoxy-2,4-dihydro-2-(4-nitrophenyl)-3H-pyrazol-3-one EINECS 223-882-0