4-Hydroxy, 2-Methyl-2h-1,2-Benzothiazine Carboxylic Acid Isopropyl Ester-1,1-Dioxide

Molecular Formula : C13H15O5NS Molecular Weight : 297 Appearance : Pinkish White Crystalline Powder Solubility : Soluble in Methanol and Chloroform Melting Range : 104A C -110A C Related Substance By TLC : No secondary spot is seen By HPLC : Not more than 1.0 % w/w Water by KF : 0.5% max Residual Solvent By HS-GC: Methanol : 500 ppm max. o-Xylene : 1000 ppm max. DMF : 880 ppm max. Assay(Dry basis) : Not less than 97% and not more than 101%