InChI=1S/C14H20N2O4/c1-15-5-3-4-9(15)14(19)20-8-6-10-12(17)13(18)11(7-8)16(10)2/h3-5,8,10-13,17-18H,6-7H2,1-2H3/t8-,10-,11+,12-,13-/m0/s1