N-Ethoxycarbonyl-5-nitro-o-toluidine is primarily used as an intermediate in the synthesis of various organic compounds, particularly in the production of dyes and pigments. Its structure allows it to participate in reactions that form complex molecules, making it valuable in the creation of colorants for textiles, inks, and coatings. Additionally, it is employed in the pharmaceutical industry for the development of certain drugs, where it serves as a building block in the synthesis of active pharmaceutical ingredients (APIs). Its nitro and ethoxycarbonyl groups make it a versatile reagent in organic chemistry, facilitating the introduction of functional groups into target molecules.