Heterocyclic compounds are probably the largest and most varied family of molecular fragments used by chemists for organic synthesis. Many of the heterocyclic scaffolds have been identified as a privileged structure in medicinal chemistry and are prevalent in a variety of pharmacologically active synthetic and natural compounds. Most chemical reaction design planning starts from these commercially available building blocks. By combining our core offering with a diverse suite of partners’ compounds, we have the industry’s most comprehensive selection of heterocyclic building blocks. Spark your chemical synthesis with our one-stop source of chemical reagents.