InChI=1S/C21H25NO6/c1-25-17-7-5-14(12-19(17)27-3)9-10-22-21(24)16(23)11-15-6-8-18(26-2)20(13-15)28-4/h5-8,11-13,23H,9-10H2,1-4H3,(H,22,24)/b16-11-