InChI=1S/C21H28O12/c1-7-4-9-12(8(2)18(28)30-9)10(5-20(3)11(22)6-21(7,29)33-20)31-19-15(25)13(23)14(24)16(32-19)17(26)27/h4,9-16,19,22-25,29H,2,5-6H2,1,3H3,(H,26,27)/b7-4-/t9?,10?,11?,12?,13?,14?,15?,16?,19?,20-,21-/m1/s1