Pyrrolidine, also known as tetrahydropyrrole, is an organic compound with the molecular formula C₄H₉N. It is a cyclic secondary amine with a five-membered heterocycle containing four carbon atoms and one nitrogen atom. It is a clear liquid with an unpleasant odor that is ammoniacal, fishy, shellfish-like.

Pyrrolidine is found naturally in the leaves of tobacco and carrot. The pyrrolidine ring structure is present in numerous natural alkaloids such as nicotine and hygrine. It is found in many pharmaceutical drugs such as procyclidine and bepridil. It also forms the basis for the racetam compounds (e.g. piracetam, aniracetam).

A pyrrolidine ring is the central structure of the amino acids proline and hydroxyproline.

In organic chemistry, pyrrolidine is used to activate ketones and aldehydes toward nucleophilic addition by formation of the iminium. It can also promote the aldol condensation of ketones and aldehydes by formation of the enamine.

Jennifer Lynn Lopez (born July 24, 1969) is an American actress, businesswoman, dancer and recording artist. Often referred to as J.Lo, she is reportedly the highest earning actress of Latin descent. Born and raised in The Bronx, New York, she enrolled in singing and dancing classes as a child and grew up in a musically influenced household. She started her career as a fly girl on the television comedy program In Living Color and a back-up dancer for Janet Jackson. Lopez gained recognition in the action-thriller Money Train (1995). Her first leading role was in the biographical film Selena (1997), which was her breakthrough role, earning her an ALMA Award for Outstanding Actress and Golden Globe nomination. She earned her second ALMA Award for her performance in Out of Sight (1998), which made her the highest-paid Latin actress. She has since appeared in various films including The Cell (2000), The Wedding Planner (2001), Maid in Manhattan (2002), Shall We Dance? (2004), Monster-in-Law (2005), The Back-up Plan (2010) and What to Expect When You're Expecting (2012).