Heterocyclic compounds are organic compounds whose molecules contain heterocyclic structures. In addition to carbon atoms, the rings contain at least one heteroatom. They are the most numerous class of organic compounds. The most common heteroatoms are nitrogen, sulfur, and oxygen. They can be divided into two main categories: alicyclic and aromatic heterocyclic compounds. Heterocyclic compounds are ubiquitous in the structures of drug molecules.
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