A variety of macrocycles have become important drugs or have been identified as leads to marketed drugs because of their varied applications in modern clinical techniques. Providing a wide reaching review of this important area in a single volume, this book will be of interest to biochemists, pharmaceutical scientists and medicinal chemists working in industry or academia.The interest to write this book is to stimulate the possibilities macrocycles offer to the creative chemist to investigate molecular recognition in new ways and therefore suggest ideas for the design and synthesis of novel complexes capable of performing useful functions.