InChI=1S/C11H16N2O7/c1-2-6(10(18)12-5-9(16)17)13-8(15)4-3-7(14)11(19)20/h6H,2-5H2,1H3,(H,12,18)(H,13,15)(H,16,17)(H,19,20)/p-2/t6-/m0/s1