[EN] SUBSTITUTED AMINO PHENYLACETIC ACIDS, DERIVATIVES THEREOF, THEIR PREPARATION AND THEIR USE AS CYCLOOXYGENASE 2 (COX-2) INHIBITORS [FR] ACIDES AMINO PHENYLACETIQUES SUBSTITUES, DERIVES DE CEUX-CI, PROCEDE POUR LES PREPARER ET LEUR UTILISATION EN TANT QU'INHIBITEURS DE CYCLOOXYGENASE 2 (COX-2)