Used as a chiral resolving agent in organic synthesis, particularly for the separation of enantiomers of carboxylic acids. Its effectiveness stems from forming diastereomeric salts with racemic mixtures, which differ in solubility and can be separated by crystallization. Commonly applied in the resolution of profen-class nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and naproxen. Also employed in asymmetric synthesis and chiral pool strategies where enantiopure intermediates are required. Its naphthyl group provides good crystallinity and stability to the formed salts, facilitating purification and isolation.