InChI=1S/C20H18O10/c21-11-5-9-6-13(29-14(9)7-12(11)22)8-2-1-3-10(4-8)28-20-17(25)15(23)16(24)18(30-20)19(26)27/h1-7,15-18,20-25H,(H,26,27)