InChI=1S/C20H18O9/c21-11-5-4-10-7-13(28-14(10)8-11)9-2-1-3-12(6-9)27-20-17(24)15(22)16(23)18(29-20)19(25)26/h1-8,15-18,20-24H,(H,25,26)