
[[Image:Models of cucurbiturils.jpg|thumbnail|400px|Computer models of CB[5], CB[6], and CB[7]. Top row is the view into the cavity and the bottom is the side view]]
[[Image:Models of cucurbiturils.jpg|thumbnail|400px|Computer models of CB[5], CB[6], and CB[7]. Top row is the view into the cavity and the bottom is the side view]]
In host–guest chemistry, cucurbiturils are macrocyclic molecules made of glycoluril () monomers linked by methylene bridges (). The oxygen atoms are located along the edges of the band and are tilted inwards, forming a partly enclosed cavity (cavitand). The name is derived from the resemblance of this molecule with a pumpkin of the family of Cucurbitaceae.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).