2,2,4-trimethyl-2H,6H-pyrimido[2,1-b][1,3]thiazin-6-one 2H,6H-pyrimido[2,1-b][1,3]thiazin-6-one, 2,2,4-trimethyl- InChI=1/C5H5N5O/c6-5-8-3-2(1-7-10-3)4(11)9-5/h1H,(H4,6,7,8,9,10,11