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