InChI=1S/C12H16N2O9/c1-14-2-4(13-3-14)8(10(18)19)22-12-7(17)5(15)6(16)9(23-12)11(20)21/h2-3,5-9,12,15-17H,1H3,(H,18,19)(H,20,21)