InChI=1S/C21H22O9/c1-27-12-6-13(22)18-14(23)8-16(30-17(18)7-12)10-2-4-11(5-3-10)29-21-20(26)19(25)15(24)9-28-21/h2-7,15-16,19-22,24-26H,8-9H2,1H3/t15-,16?,19+,20-,21+/m1/s1