2,3-Dihydro-2-(3-hydroxy-4-methoxyphenyl)-4H-1,3-benzothiazin-4-one 4-Oxo-2-(3-hydroxy-4-methoxyphenyl)-2,3-dihydro-5,6-benzo-1,3-thiazine 4H-1,3-Benzothiazin-4-one, 2,3-dihydro-2-(3-hydroxy-4-methoxyphenyl)- 63223-54-1