InChI=1S/C20H18O11/c21-10-3-8(4-11(22)14(10)23)12-5-7-1-2-9(6-13(7)30-12)29-20-17(26)15(24)16(25)18(31-20)19(27)28/h1-6,15-18,20-26H,(H,27,28)