InChI=1S/C12H18N2O6/c1-7(11(17)19-3)13-9(15)5-6-10(16)14-8(2)12(18)20-4/h5-8H,1-4H3,(H,13,15)(H,14,16)/b6-5+/t7-,8-/m0/s1