2-(methylthio)-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid 4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid, 2-(methylthio)-4-oxo- InChI=1/C10H8N2O3S/c1-16-8-7(10(14)15)9(13)12-5-3-2-4-6(12)11-8/h2-5H,1H3,(H,14,15