InChI=1S/C21H22O9/c22-13(11-7-3-1-4-8-11)18(14(23)12-9-5-2-6-10-12)29-21-17(26)15(24)16(25)19(30-21)20(27)28/h1-10,13,15-19,21-22,24-26H,(H,27,28)