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Celebrex M Celecoxib-4 Celecoxib Impurity 52 4-[5-hydroxy-3-(4-methylphenyl)-5-(trifluoromethyl)-4H-pyrazol-1-yl]benzenesulfonamide 4-(5-hydroxy-3-(p-tolyl)-5-(trifluoromethyl)-4,5-dihydro-1H- pyrazol-1-yl)benzenesulfonamide