InChI=1/C15H20N2O4/c1-11-5-6-12(17(20)21)9-13(11)14(19)16-15(10-18)7-3-2-4-8-15/h5-6,9,18H,2-4,7-8,10H2,1H3,(H,16,19)/f/h16H 9037D4A9BD7A4B0F