InChI=1S/C21H36O9/c1-12(8-9-15(23)21(3,4)28)6-5-7-13(2)10-16(24)30-20-19(27)18(26)17(25)14(11-22)29-20/h6,10,14-15,17-20,22-23,25-28H,5,7-9,11H2,1-4H3/b12-6+,13-10+