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