InChI=1S/C15H20N2O7/c1-4-8-9(17-6(2)5-16-8)7(3)23-15-12(20)10(18)11(19)13(24-15)14(21)22/h4-5,7,10-13,15,18-20H,1H2,2-3H3,(H,21,22)