Used as a key intermediate in the synthesis of biologically active quinoline compounds, particularly in pharmaceutical research for developing antimicrobial, antiviral, and anticancer agents. The structure featuring cyano and ester groups facilitates subsequent reactions, such as conversion of the cyano group to carboxyl or amide, or hydrolysis of the ester to yield carboxylic acids for further elaboration into pharmacologically active substances. Commonly employed in the creation of lead compounds for laboratory testing of biological activity.