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