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