Five Member Heterocyclic Compounds with Nitrogen and Sulfur or Nitrogen, Sulfur and Oxygen (Except Thiazole), Volume 4The Chemistry of Heterocyclic Compounds, since its inception, has been recognised as a cornerstone of heterocyclic chemistry. Each volume attempts to discuss all aspects properties, synthesis, reactions, physiological, and industrial significance of a specific ring system. To keep the series up to date, supplementary volumes covering the recent literature on each individual ring system have been published. Many ring systems (such as pyridines and