InChI=1S/C20H30O13/c1-8(4-3-5-9(2)22)18(29)33-20-17(28)15(26)13(24)11(32-20)7-30-19-16(27)14(25)12(23)10(6-21)31-19/h3-5,10-17,19-21,23-28H,6-7H2,1-2H3/b5-3+,8-4+