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