InChI=1S/C21H20O11/c1-29-15-5-8-4-14(31-13(8)7-12(15)23)10-3-2-9(6-11(10)22)30-21-18(26)16(24)17(25)19(32-21)20(27)28/h2-7,16-19,21-26H,1H3,(H,27,28)