1H-pyrido[2,1-b]benzothiazol-1-one, 4-(4-methylbenzoyl)- 4-(4-methylbenzoyl)-1H-pyrido[2,1-b][1,3]benzothiazol-1-one InChI=1/C19H13NO2S/c1-12-6-8-13(9-7-12)18(22)14-10-11-17(21)20-15-4-2-3-5-16(15)23-19(14)20/h2-11H,1H