InChI=1S/C16H20N2O2/c1-4-16(2,3)18-10-11(9-13(17)15(19)20)12-7-5-6-8-14(12)18/h4-8,10,13H,1,9,17H2,2-3H3,(H,19,20)/t13-/m0/s1