InChI=1S/C20H20N2O6/c1-27-15-8-10(2-4-13(15)23)18-20(26,19(24)25)17-14(28-18)5-3-12-16(17)11(6-7-21)9-22-12/h2-5,8-9,18,22-23,26H,6-7,21H2,1H3,(H,24,25)