InChI=1/C15H20N2O4/c1-11-2-3-13(18)12(10-11)15(21)17-8-6-16(7-9-17)5-4-14(19)20/h2-3,10,18H,4-9H2,1H3,(H,19,20)/f/h16H 8BAE5A84520BEFD4