... 4-hydroxy-2-methyl-2H-1, 2-benzothiazine-3carboxylate 1, -dioxide ≤ 0.05% 0.0323% 5-methylthiazol-2-ylamine ≤ 0 ... 2-yl)-2H-1, 2-benzothiazine-3-carboxamide 1,1-dioxide ≤ 0.05% No trace Methyl 4-hydroxy-2-methyl ... -2H-1, 2-benzothiazine-3-carboxylate 1,1-dioxide ≤ 0.1% No trace 4-hydroxy-2-methyl-N ... -2-yl)-2H-1, 2-benzothiazine-3-carboxamide 1,1-dioxide ≤ 0.1% No trace Total related substance ≤ 0.3 ...