InChI=1S/C23H22N4O/c24-20(12-19-14-27-23-4-2-1-3-22(19)23)16-28-21-11-18(13-26-15-21)6-5-17-7-9-25-10-8-17/h1-11,13-15,20,27H,12,16,24H2/b6-5+/t20-/m0/s1