InChI=1S/C16H20N2O8/c17-4-10(19)8-5-18-9-2-1-6(3-7(8)9)25-16-13(22)11(20)12(21)14(26-16)15(23)24/h1-3,5,10-14,16,18-22H,4,17H2,(H,23,24)