InChI=1S/C18H30O9/c19-11-9-7-5-3-1-2-4-6-8-10-12(20)26-18-15(23)13(21)14(22)16(27-18)17(24)25/h2,4,13-16,18-19,21-23H,1,3,5-11H2,(H,24,25)/b4-2-