InChI=1S/C21H22O9/c22-10-15-17(24)18(25)19(26)21(30-15)29-14-9-13(23)8-12(16(14)20(27)28)7-6-11-4-2-1-3-5-11/h1-9,15,17-19,21-26H,10H2,(H,27,28)/b7-6+/t15-,17-,18+,19-,21-/m1/s1