109418-06-6 2H-Pyrido(3,2-e)(1,2)thiazine-3-carboxamide, 4-hydroxy-N-phenyl-2,5,7-trimethyl-, 1,1-dioxide 4-Hydroxy-N-phenyl-2,5,7-trimethyl-2H-pyrido(3,2-e)(1,2)thiazine-3-carboxamide 1,1-dioxide