Ethyl 4-(n-butylamino)benzoate is an organic compound used primarily as an intermediate in the synthesis of pharmaceutical agents, particularly local anesthetics and related bioactive molecules. Its structure, featuring a benzoate ester with a butylamino substituent, allows it to serve as a building block in medicinal chemistry for developing compounds with potential analgesic or anesthetic properties. It is commonly employed in research and development settings for creating custom derivatives, and may find applications in biochemical assays or as a niche additive in formulations requiring specific solubility or reactivity profiles.