InChI=1S/C20H20O11/c21-9-3-8(17-16(30-17)7-1-2-11(22)12(23)5-7)4-10(6-9)29-20-15(26)13(24)14(25)18(31-20)19(27)28/h1-6,13-18,20-26H,(H,27,28)