InChI=1S/C21H26O7/c1-26-18-7-5-13(11-20(18)28-3)8-15(12-22)16(21(24)25)9-14-4-6-17(23)19(10-14)27-2/h4-7,10-11,15-16,22-23H,8-9,12H2,1-3H3,(H,24,25)