In a composition comprising a therapeutic agent and a compound which is a trisaccharide or higher polysaccharide, that compound has the formula X\u2014Y-Zn wherein X and Z are each saccharide molecules in which none, some or all OH groups are derivatised; Y is an ester linkage to an exocyclic C atom in X; and n in an integer. The cap and the shank form a peripheral hollow joint that is defined by a recessed end surface of the shank and a back surface of the cap. In order to obtain the above characteristic feature, a process method to be implemented into the method of manufacturing a normal silicon wafer is provided.