InChI=1S/C19H28O8/c1-5-6-7-10-9(2)12(20)11(8-19(10,3)4)26-18-15(23)13(21)14(22)16(27-18)17(24)25/h5-6,11,13-16,18,21-23H,7-8H2,1-4H3,(H,24,25)/b6-5-