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