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1-Hydroxy Valdecoxib Parecoxib Valdecoxib IMpurity B BenzenesulfonaMide, 3-[4-[4-(aMinosulfonyl)phenyl]-5-Methyl-3-isoxazolyl]- Valdecoxib 3-methyl -4,5-diphenyl-4,5-didydro-isoxazole N-((4-(5-Methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)acetaMide 4-(4-chlorophenyl)-5-methyl-3-phenylisoxazole Valdecoxib 3'-Sulfonyl Chloride IMpurity 5-(Difluoromethoxy)-2-mercapto-1H-benzimidazole