InChI=1S/C12H18N4O2/c1-7(2)3-9-11(17)16-10(12(18)15-9)4-8-5-13-6-14-8/h5-7,9-10H,3-4H2,1-2H3,(H,13,14)(H,15,18)(H,16,17)/t9-,10-/m0/s1