👉 In chemistry, a heterocycle is a type of molecule that consists of two or more cyclic molecules. These molecules are typically unbranched and contain only one type of carbon atom. The term "heterocycle" was coined by the American chemist William Henry Harrison in 1905 to describe the structure of heterocycles, which were previously known as tricyclics. The concept of a heterocycle is based on the fact that each carbon atom in
