InChI=1/C16H20N2O2/c1-3-16(4-2)14(19)18-15(20-16)17-13-9-11-7-5-6-8-12(11)10-13/h5-8,13H,3-4,9-10H2,1-2H3,(H,17,18,19)/f/h17H 5DDDB46E2285C23E