InChI=1S/C21H24N2O4/c24-19(22-17-9-3-1-4-10-17)26-15-21(13-7-8-14-21)16-27-20(25)23-18-11-5-2-6-12-18/h1-6,9-12H,7-8,13-16H2,(H,22,24)(H,23,25)