In particular, Medicina/ chemistry also involves the discovery of new chemical entities for the treatment of diseases and the systematic study of the structure-activity relationships of the active compounds. Such studies provide the basis for development of better medicinal agents from lead compounds found via random screening, systematic screening and rational design• In particular, Medicinal chemistry also involves the discovery of new chemical entities for the treatment of diseases and the systematic study of the structure-activity relationships of the active compounds. Such studies provide the basis for development of better medicinal agents from lead compounds found via random screening, systematic screening and rational design