InChI=1S/C16H20N2O5/c1-16(2)6-12(22)14-13(23-16)4-3-10(15(14)17)11(21)5-9(7-19)18-8-20/h3-4,8-9,19H,5-7,17H2,1-2H3,(H,18,20)