InChI=1S/C21H20O13/c22-8-5-11(25)14(15(27)12(26)4-7-1-2-9(23)10(24)3-7)13(6-8)33-21-18(30)16(28)17(29)19(34-21)20(31)32/h1-3,5-6,16-19,21-25,28-30H,4H2,(H,31,32)