5Manjarrez Norberto,P‘exez Herminial I,Solis Aida et el."A facile one-pot synthesis of 4-hydroxy-3-methoxyearbonyl-2-methyl-2H-1,2-benzothiazinel,1-dioxide,a key intermediat in the synthesis of oxicam antünflammatory agents.". Synth Cor(?)un . 1996
6Trummlitz Günter,Engel Wolfhard,Seeger Emst et al."4Hydroxy-2H-1,2-benzothiazine-3-carboxamide-1,1dioxide and salts thereof.". U.S.pat.4,233,299 . 1980
7Genzer Jerome D."Proess for the preparatien of 4-hydroxy3-(5-mehy1-3-isoxazolylcarbamoyl)-2-methyl-2H-1,2-benzothiazine 1,1-dioxide.". U.S,pat.3,960,856 . 1976
8Erlenmeyer H,Herzfeld Z,and Prijs B.152. Zur Synthese yon 2-Amino-thiazolderivaten. Heir.Chim.Aeta . 1955