InChI=1S/C12H20N2O4/c1-3-4-8(2)7-11(16)14-9(12(17)18)5-6-10(13)15/h7,9H,3-6H2,1-2H3,(H2,13,15)(H,14,16)(H,17,18)/p-1/b8-7+/t9-/m0/s1