InChI=1S/C19H18O8/c1-26-16-6-3-11(8-15(16)22)4-7-18(23)27-17(19(24)25)10-12-2-5-13(20)14(21)9-12/h2-9,17,20-22H,10H2,1H3,(H,24,25)/b7-4+/t17-/m0/s1