InChI=1S/C21H24O6/c1-12(2)5-6-14-7-8-17(18(21(24)25)20(14)26-4)27-19-15(11-22)9-13(3)10-16(19)23/h5-10,12,22-23H,11H2,1-4H3,(H,24,25)/b6-5+