InChI=1S/C21H24O8/c1-10-3-5-12(21(2)9-28-21)7-14-11(4-6-13(10)14)8-27-20-17(24)15(22)16(23)18(29-20)19(25)26/h3-7,15-18,20,22-24H,8-9H2,1-2H3,(H,25,26)