InChI=1S/C16H20N2O7/c17-5-10(8-6-18-9-4-2-1-3-7(8)9)24-16-13(21)11(19)12(20)14(25-16)15(22)23/h1-4,6,10-14,16,18-21H,5,17H2,(H,22,23)