InChI=1S/C20H20O10/c21-10-3-1-8(2-4-10)16-17(29-16)9-5-11(22)7-12(6-9)28-20-15(25)13(23)14(24)18(30-20)19(26)27/h1-7,13-18,20-25H,(H,26,27)