The pentaquark, an elusive particle first spotted by the Large Hadron Collider in 2015, is made of two smaller particles stuck together in a sort of miniature molecule
Source:
https://www.newscientist.com/article/2205795-bizarre-pentaquark-turns-out-to-be-a-new-kind-of-subatomic-molecule/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home