InChI=1S/C21H25NO5/c1-24-17-8-5-15(13-19(17)26-3)7-10-21(23)22-12-11-16-6-9-18(25-2)20(14-16)27-4/h5-10,13-14H,11-12H2,1-4H3,(H,22,23)/b10-7+