1H-pyrido[2,1-b]benzothiazol-1-one, 4-acetyl- 4-acetyl-1H-pyrido[2,1-b][1,3]benzothiazol-1-one InChI=1/C13H9NO2S/c1-8(15)9-6-7-12(16)14-10-4-2-3-5-11(10)17-13(9)14/h2-7H,1H