2-(methylthio)-4H-pyrido[1,2-a]pyrimidin-4-one 4H-pyrido[1,2-a]pyrimidin-4-one, 2-(methylthio)- InChI=1/C9H8N2OS/c1-13-8-6-9(12)11-5-3-2-4-7(11)10-8/h2-6H,1H