4-(3-Methyl-5-oxo-2-pyrazolin-1-yl)benzoic acid 4-(4,5-Dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzoic acid 60875-16-3 Benzoic acid, 4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- EINECS 262-509-6