1-(2,2,4,8-tetramethyl-2H,6H-pyrimido[2,1-b][1,3]thiazin-7-yl)ethanone InChI=1/C13H18N2OS/c1-8-6-13(4,5)17-12-14-9(2)11(10(3)16)7-15(8)12/h6H,7H2,1-5H ethanone, 1-(2,2,4,8-tetramethyl-2H,6H-pyrimido[2,1-b][1,3]thiazin-7-yl)-