5-methyl-7H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one 7H-1,3,4-thiadiazolo[3,2-a]pyrimidin-7-one, 5-methyl- InChI=1/C6H5N3OS/c1-4-2-5(10)8-6-9(4)7-3-11-6/h2-3H,1H