InChI=1S/C19H28N4O2/c1-13(2)5-10-17(24)23-11-3-4-16(23)19(25)22-12-14-6-8-15(9-7-14)18(20)21/h6-9,13,16H,3-5,10-12H2,1-2H3,(H3,20,21)(H,22,25)/t16-/m0/s1