InChI=1S/C19H17N3O2/c1-22-11-13-7-9-20-15-10-16(19(24)18(22)17(13)15)21-8-6-12-2-4-14(23)5-3-12/h2-6,8,10-11,21,23H,7,9H2,1H3/b8-6+