InChI=1S/C20H18O12/c21-8-5-6-12(31-20-15(24)13(22)14(23)16(32-20)18(27)28)10(7-8)19(29)30-11-4-2-1-3-9(11)17(25)26/h1-7,13-16,20-24H,(H,25,26)(H,27,28)