InChI=1S/C16H20N2O2/c1-10(2)6-7-11-4-3-5-13-12(9-18-15(11)13)8-14(17)16(19)20/h3-6,9,14,18H,7-8,17H2,1-2H3,(H,19,20)/t14-/m0/s1