2-fluoro-4,5-dimethoxybenzoic acid InChI=1/C9H9FO4/c1-13-7-3-5(9(11)12)6(10)4-8(7)14-2/h3-4H,1-2H3,(H,11,12 benzoic acid, 2-fluoro-4,5-dimethoxy-