InChI=1S/C19H26O9/c1-3-13(9-7-5-4-6-8-12(21)10-15(22)26-2)27-19-18(25)17(24)16(23)14(11-20)28-19/h3,12-14,16-21,23-25H,1,6,8,10-11H2,2H3