InChI=1S/C12H16N2O9/c1-3-4(9(18)14-12(21)13-3)2-22-11-7(17)5(15)6(16)8(23-11)10(19)20/h5-8,11,15-17H,2H2,1H3,(H,19,20)(H2,13,14,18,21)