Disclosed are formulations comprising a lipophilic Amyloid beta ligand stilbene, ethanol, a polyether, ascorbic acid and sodium ascorbate, specifically formulations which are capable to be administered parenterally e.g. intravenously, wherein the lipophilic Amyloid beta ligand stilbene is a fluorinated stilbene such as methyl-[4-((F)-2-{ 4-[2-(2-propoxy-ethoxy)-ethoxy]-phenyl} -vinyl)-phenyl]-amine. Further, the invention is directed to a method for sterile filtration of formulations suitable for PET imaging of mammals.
