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