InChI=1S/C19H20O9/c20-13-14(21)16(17(23)24)28-19(15(13)22)26-8-4-3-6-11-9-10-5-1-2-7-12(10)18(25)27-11/h1-3,5-7,9,13-16,19-22H,4,8H2,(H,23,24)/b6-3+