InChI=1/C18H18N2O3/c1-10-6-7-12(8-11(10)2)19-17(22)14-9-13-15(20-18(14)23)4-3-5-16(13)21/h6-9H,3-5H2,1-2H3,(H,19,22)(H,20,23)/f/h19-20H 641783B490D53A4C