The present invention relates to a process for separating the water from an aqueous lactam solution. The alignment film includes a plurality of alignment molecules formed by polymerizing monomers having at least a photosensitive group, and has formula e aswherein the component A andor the component B in formula e comprise terphenyl. The construction disclosed of the legs, ribs and hub enhances the capability of the base structure in providing good stability as well as the capability of withstanding internal pressure and stress cracking. The protective layer 7 at the bottom of the cavity 6 is subjected to an anisotropic etching treatment and also the encapsulation layer 2 is subjected to etching, whereafter the cavity is filled with copper. The ligands are useful with catalytic gold complexes, particularly Au complexes.