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