InChI=1S/C21H22O10/c1-29-15-9-11(4-6-12(15)22)3-2-10-5-7-14(13(23)8-10)30-21-18(26)16(24)17(25)19(31-21)20(27)28/h2-9,16-19,21-26H,1H3,(H,27,28)/b3-2+