Crystalline forms of imiquimod, a process for the preparation thereof and the use thereof in the purification of imiquimod. The lower base has a rectangular shape with an indentation at the back rail to accept the tree. A gas feeding port is arranged in the processing space on an opposite side of the hydrogen catalyzing member to the substrate for feeding a processing gas including at least hydrogen gas. The apparatus transmits a frame to the plurality of stations. The switch controls multiple functions of the flashlight including a strobe and a momentary mode. Several contact assemblies may be positioned within a housing or substrate, to form a connector assembly which may then be positioned on and electrically coupled to a second substrate, forming an electronic assembly.