InChI=1S/C23H20O10/c1-31-22-17(28)5-11(6-18(22)29)23(30)33-20-9-13-15(26)7-12(24)8-19(13)32-21(20)10-2-3-14(25)16(27)4-10/h2-8,20-21,24-29H,9H2,1H3/t20-,21-/m1/s1