InChI=1S/C15H20N2O4/c1-4-10(5-2)14(19)17-13-8-11(15(20)21)6-7-12(13)16-9(3)18/h6-8,10H,4-5H2,1-3H3,(H,16,18)(H,17,19)(H,20,21)