InChI=1S/C14H20N2O5/c1-20-11-6-8(2-3-10(11)18)12-13(21-12)14(19)16-7-9(17)4-5-15/h2-3,6,9,12-13,17-18H,4-5,7,15H2,1H3,(H,16,19)