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