InChI=1S/C18H20N2O6/c19-13(17(23)24)5-9-1-3-11(15(21)7-9)12-4-2-10(8-16(12)22)6-14(20)18(25)26/h1-4,7-8,13-14,21-22H,5-6,19-20H2,(H,23,24)(H,25,26)