(+)-(S)-3-Phenylpyrrolidine is a chiral, non-racemic secondary amine featuring a pyrrolidine ring substituted at the 3-position with a phenyl group. It is a versatile building block in organic synthesis, valued for its structural rigidity and the presence of a basic nitrogen atom. Its primary and most significant application is as a key chiral intermediate in the pharmaceutical industry. It serves as a crucial scaffold for the synthesis of various bioactive molecules and active pharmaceutical ingredients (APIs). Notably, it is a core structural component in the synthesis of preclamol, a dopamine autoreceptor agonist, and has been investigated as a precursor for other central nervous system (CNS) active compounds and enzyme inhibitors. The compound is commercially available in high enantiomeric purity and is commonly used in asymmetric synthesis and medicinal chemistry research to introduce the (S)-3-phenylpyrrolidine pharmacophore. It requires careful handling as it is moisture-sensitive and should be stored under an inert atmosphere.