InChI=1S/C14H16N2O4/c1-8(17)13(18)16-12(14(19)20)6-9-7-15-11-5-3-2-4-10(9)11/h2-5,7-8,12,15,17H,6H2,1H3,(H,16,18)(H,19,20)/t8-,12-/m0/s1