The subject matter of the invention under consideration is directed to picture frames that can be quickly and safely assembled, installed, and disassembled to display artwork. Novel fluorinated 3-imidazolidin-1-yl)-3-arylpropanoic acid derivatives and pharmaceutically acceptable salts or solvates thereof and their use are described. The third support bar is fixedly connected to the first support bar near a second end thereof. A spray section is provided in which liquid is sprayed through nozzles designed to provide a mean droplet size having a terminal velocity of from about sixty percent to about ninety five percent of the superficial upward gas velocity. The valve is displaceable by pressing the ends between a closed configuration in which the pistons block liquid from the cavity from entering the interstitial space, and a dispensing configuration in which the interstitial space is aligned with the passage and the spout to allow liquid from the cavity to reach the spout. The expected document being associated with other documents in order to represent future workflow events.