Cucurbiturils (CBs) are a class of macrocyclic compounds composed of glycoluril units connected by methylene bridges, forming a rigid, symmetrical, barrel-shaped structure. They are named after the resemblance of their shape to a pumpkinned (Cucurbitaceae family). The interior cavity of cucurbiturils can encapsulate various guest molecules, which makes them highly versatile in a range of chemical applications, including catalysis.
