InChI=1S/C21H20O13/c22-8-5-10(23)12-11(6-8)34-21(31,18(12)28)17(27)7-1-3-9(4-2-7)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)