InChI=1S/C14H12N2O6/c17-11-5-8(7-3-1-2-4-9(7)15-11)13(20)16-10(14(21)22)6-12(18)19/h1-5,10H,6H2,(H,15,17)(H,16,20)(H,18,19)(H,21,22)/t10-/m0/s1