InChI=1S/C12H16N2O9/c15-6-7(16)9(11(20)21)23-12(8(6)17)22-5(10(18)19)3-14-2-1-13-4-14/h1-2,4-9,12,15-17H,3H2,(H,18,19)(H,20,21)