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