InChI=1S/C21H30O12/c1-21(29,10-22)15(24)9-32-20-19(28)18(27)17(26)14(33-20)8-31-16(25)6-4-11-3-5-12(23)13(7-11)30-2/h3-7,14-15,17-20,22-24,26-29H,8-10H2,1-2H3/b6-4+