InChI=1S/C22H18O10/c23-13-2-1-9(3-15(13)25)21-18(28)8-12-14(24)6-11(7-19(12)32-21)31-22(30)10-4-16(26)20(29)17(27)5-10/h1-7,18,21,23-29H,8H2/t18-,21+/m0/s1