An anti-leak system for preventing nail polish from leaking from a nail polish bottle featuring a collar that wraps around the shoulder area, the thread area and the cap of the nail polish bottle. A work function of the second electrode is 4 eV or less. Thus, bromofluorenes can be efficiently and economically prepared without using any environmentally harmful organic solvent requiring a high cost to dispose of. A connecting portion extends from a third portion of the perimeter wherein the connecting portion connects the first and second wall portions to form a continuous wall. Another radiation-senstive composition includes a nonpolymerc silsesquioxane including at least one aqueous base soluble moiety, a polymer including an aqueous base soluble moiety, a crosslinker, and a radiation-sensitive acid generator. When the destination address is not assigned address, the unassigned data transport unit transport the data to a switching device among the plurality of switching devices consisting the switching system to which the destination address is assigned.