InChI=1S/C18H20N4O/c23-14-8-6-13(7-9-14)20-18-15-10-11-19-17(15)21-16(22-18)12-4-2-1-3-5-12/h1-5,10-11,13-14,23H,6-9H2,(H2,19,20,21,22)/t13-,14-