InChI=1S/C14H16N2O6/c1-9(17)15-16(11(14(21)22)7-8-12(18)19)13(20)10-5-3-2-4-6-10/h2-6,11H,7-8H2,1H3,(H,15,17)(H,18,19)(H,21,22)