InChI=1S/C21H20O12/c22-7-1-2-9-10(3-7)31-18-13-11(30-6-21(9,18)29)4-8(23)5-12(13)32-20-16(26)14(24)15(25)17(33-20)19(27)28/h1-5,14-18,20,22-26,29H,6H2,(H,27,28)