InChI=1S/C21H22O10/c1-8-15(24)17(26)19(28)21(29-8)30-10-3-4-11-14(7-10)31-20(18(27)16(11)25)9-2-5-12(22)13(23)6-9/h2-8,15,17-24,26-28H,1H3