InChI=1S/C21H32O9/c1-10(2)13-8-14(22)11(3)5-4-6-12(7-15(13)23)9-29-21-18(26)16(24)17(25)19(30-21)20(27)28/h6,10-11,13,16-19,21,24-26H,4-5,7-9H2,1-3H3,(H,27,28)/b12-6+