Filling a gap in the market, this two-volume set is the first to present important pharmaceuticals as well as agrochemical pesticides in one handy work. Each of the around 40 chapters covers in a concise manner one class of heterocycles, clearly structured as follows: * Structural formulas of most important examples (market products) * Short background of history or discovery * Typical syntheses of important examples * Mode of action * Characteristic biological activity * Structure-activity relationship * Additional chemistry information (e.g. further transformations, alternative syntheses, metabolic pathways, etc.) * References. A valuable one-stop reference source for researchers in academia and industry as well as for graduate students with career aspirations in the field of pharmaceutical and agrochemical chemistry.