InChI=1/C14H16N2O8/c17-11(18)2-1-8(12(19)20)15-4-3-7-5-9(13(21)22)16-10(6-7)14(23)24/h3-5,8,10,15H,1-2,6H2,(H,17,18)(H,19,20)(H,21,22)(H,23,24)/b4-3+/t8-,10-/s2