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