InChI=1S/C21H20O12/c22-7-1-2-9-12(3-7)31-18-8-4-10(23)13(5-11(8)30-6-21(9,18)29)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)