InChI=1S/C21H32O9/c1-10(2)21(9-13(22)12(4)7-5-6-11(3)8-14(21)23)30-20-17(26)15(24)16(25)18(29-20)19(27)28/h6,10,12,15-18,20,24-26H,5,7-9H2,1-4H3,(H,27,28)/b11-6-