InChI=1S/C21H20O9/c22-8-16-18(25)19(26)20(27)21(30-16)29-12-4-1-10(2-5-12)14-9-28-15-7-11(23)3-6-13(15)17(14)24/h1-7,9,16,18-23,25-27H,8H2/t16-,18-,19+,20-,21-/m1/s1