InChI=1S/C20H21N3O3/c21-16(11-14-12-22-17-9-5-4-8-15(14)17)19(24)23-18(20(25)26)10-13-6-2-1-3-7-13/h1-9,12,16,18,22H,10-11,21H2,(H,23,24)(H,25,26)