InChI=1S/C21H20O13/c22-8-3-1-7(2-4-8)17(27)21(31)18(28)12-10(23)5-9(6-11(12)34-21)32-20-15(26)13(24)14(25)16(33-20)19(29)30/h1-6,13-17,20,22-27,31H,(H,29,30)