InChI=1S/C21H14N2O8/c24-19(12-4-3-5-13(10-12)23(29)30)22-17-6-1-2-7-18(17)31-14-8-9-15(20(25)26)16(11-14)21(27)28/h1-11H,(H,22,24)(H,25,26)(H,27,28)