InChI=1S/C21H20O9/c22-9-17-18(25)19(26)20(27)21(30-17)28-12-4-1-10(2-5-12)15-8-14(24)13-6-3-11(23)7-16(13)29-15/h1-8,17-23,25-27H,9H2/t17-,18-,19+,20-,21-/m1/s1