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