InChI=1S/C19H26O8/c1-9-5-13-18(7-20,6-12(9)25-10(2)21)17(4)15(26-11(3)22)14(23)16(27-13)19(17)8-24-19/h5,12-16,20,23H,6-8H2,1-4H3