InChI=1S/C20H18O16/c21-5-1-3(17(30)31)7(11(25)9(5)23)8-4(2-6(22)10(24)12(8)26)19(34)36-20-15(29)13(27)14(28)16(35-20)18(32)33/h1-2,13-16,20-29H,(H,30,31)(H,32,33)