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