InChI=1S/C20H22N2O4/c1-22(2)16(13-14-9-5-3-6-10-14)19(24)21-17(20(25)26)18(23)15-11-7-4-8-12-15/h3-12,16-17H,13H2,1-2H3,(H,21,24)(H,25,26)