InChI=1S/C18H30O9/c1-11(9-7-5-3-2-4-6-8-10-12(19)20)26-18-15(23)13(21)14(22)16(27-18)17(24)25/h2,4,11,13-16,18,21-23H,3,5-10H2,1H3,(H,19,20)(H,24,25)/b4-2-