InChI=1S/C21H20O9/c1-9-16(23)19(26)20(27)21(28-9)30-14-8-13-15(18(25)17(14)24)11(22)7-12(29-13)10-5-3-2-4-6-10/h2-9,16,19-21,23-27H,1H3/t9-,16+,19+,20-,21+/m1/s1