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