InChI=1S/C21H20O10/c1-28-16-4-9(2-3-11(16)22)15-7-13(24)18-12(23)5-10(6-17(18)31-15)30-21-20(27)19(26)14(25)8-29-21/h2-7,14,19-23,25-27H,8H2,1H3/t14-,19+,20+,21-/m0/s1