InChI=1S/C19H18N2O2/c1-11-6-8-12(9-7-11)17-18-14(10-16(21-17)19(22)23)13-4-2-3-5-15(13)20-18/h2-9,16-17,20-21H,10H2,1H3,(H,22,23)