InChI=1S/C21H20O10/c22-10-3-1-9(2-4-10)7-14-15(23)12-6-5-11(8-13(12)30-14)29-21-18(26)16(24)17(25)19(31-21)20(27)28/h1-8,15-19,21-26H,(H,27,28)