InChI=1S/C21H22N2O6/c1-29-18-12-15(7-9-17(18)24)8-10-19(25)22-13-20(26)23-16(21(27)28)11-14-5-3-2-4-6-14/h2-10,12,16,24H,11,13H2,1H3,(H,22,25)(H,23,26)(H,27,28)/b10-8+