InChI=1S/C21H30O9/c1-9(2)11-4-5-20(7-11)10(3)6-12(22)17-21(20,30-17)8-28-19-15(25)13(23)14(24)16(29-19)18(26)27/h10-11,13-17,19,23-25H,1,4-8H2,2-3H3,(H,26,27)