InChI=1S/C21H24O12/c1-21(2,20(29)33-19-14(26)12(24)13(25)17(32-19)18(27)28)7-9-15-8(4-5-11(23)31-15)6-10(22)16(9)30-3/h4-6,12-14,17,19,22,24-26H,7H2,1-3H3,(H,27,28)