InChI=1S/C14H16N2O4/c17-7-10-11(18)12(19)13(20)14-15-9(6-16(10)14)8-4-2-1-3-5-8/h1-6,10-13,17-20H,7H2/t10-,11-,12+,13-/m1/s1