InChI=1S/C19H20N4O2/c20-19-23-22-18(25-19)11-21-17-10-16(17)14-6-8-15(9-7-14)24-12-13-4-2-1-3-5-13/h1-9,16-17,21H,10-12H2,(H2,20,23)/t16-,17+/m0/s1