InChI=1S/C19H26O9/c1-10(20)28-19(2,3)9-12(11-7-5-4-6-8-11)26-18-15(23)13(21)14(22)16(27-18)17(24)25/h4-8,12-16,18,21-23H,9H2,1-3H3,(H,24,25)