4-Aminobenzenepropanoic acid ethyl ester is primarily used in organic synthesis as an intermediate for the production of various pharmaceuticals and fine chemicals. Its structure, featuring both an amino group and an ester functional group, makes it a versatile building block in the synthesis of compounds such as dyes, pigments, and active pharmaceutical ingredients (APIs). It is particularly valuable in the development of anti-inflammatory and analgesic drugs, where its derivatives can exhibit therapeutic properties. Additionally, it serves as a precursor in the synthesis of complex organic molecules for research and industrial applications, contributing to advancements in medicinal chemistry and material science.