InChI=1S/C21H20O13/c22-7-3-1-6(2-4-7)18-15(27)13(25)10-8(32-18)5-9(11(23)12(10)24)33-21-17(29)14(26)16(28)19(34-21)20(30)31/h1-5,14-19,21-24,26-29H,(H,30,31)