2H-1,4-benzothiazine-5-carboxylic acid, 3,4-dihydro-8-methyl-, ethyl ester InChI=1/C12H15NO2S/c1-3-15-12(14)9-5-4-8(2)11-10(9)13-6-7-16-11/h4-5,13H,3,6-7H2,1-2H ethyl 8-methyl-3,4-dihydro-2H-1,4-benzothiazine-5-carboxylate