The present invention relates to a novel crystals of 5–propionyl-1–ethyl-amino}-methyl)-2-methoxy-benzoic acid and methods of making the zwitterion of 5–propionyl-1–ethyl-amino}-methyl)-2-methoxy-benzoic acid. A large-capacity and high-output small fuel cell system is provided by such a structure. The TSP also performs cryptographic handshakes with the call initiator and call recipient to authenticate callers.