InChI=1S/C18H20O10/c19-7-2-1-5-9-8-4-3-6-10(11(8)17(25)26-9)27-18-14(22)12(20)13(21)15(28-18)16(23)24/h3-6,12-15,18-22H,1-2,7H2,(H,23,24)/b9-5+