InChI=1S/C20H28N4O2/c1-3-5-23-16-15(17(25)24(6-4-2)19(23)26)21-18(22-16)20-10-12-7-13(11-20)9-14(20)8-12/h12-14H,3-11H2,1-2H3,(H,21,22)/t12-,13+,14?,20?