InChI=1S/C21H20O9/c1-8-3-10-16(13(4-8)28-2)19(26)15-11(17(10)24)5-9(6-12(15)23)29-21-20(27)18(25)14(7-22)30-21/h3-6,14,18,20-23,25,27H,7H2,1-2H3/t14-,18-,20-,21+/m1/s1