InChI=1S/C15H20N2O2/c1-10(2)8-12-14(18)17-13(15(19)16-12)9-11-6-4-3-5-7-11/h3-7,10,12-13H,8-9H2,1-2H3,(H,16,19)(H,17,18)/t12-,13-/m0/s1