Heterocycle

A heterocycle is a ring-shaped molecule made up of atoms of at least two different elements, with nitrogen, oxygen, or sulfur being the most common additions to a carbon backbone. These structures are incredibly important in chemistry and medicine because they form the foundation of many drugs, vitamins, and natural compounds like caffeine and DNA. Think of them as carbon rings with some of the carbon atoms replaced by other elements, creating molecules with unique properties that make them useful for treating diseases and powering biological processes.