4H-Pyrido(3,2-e)-1,3-thiazine-6-carboxylic acid, 7-methyl-4-oxo-2-(2-propenylamino)-, ethyl ester 81960-08-9 Ethyl 3H-2-allylimino-7-methyl-4-oxopyrido(3,2-e)-1,3-thiazine-6-carboxylate