Used as a derivatizing agent in analytical chemistry, particularly for the detection and quantification of carbonyl compounds such as aldehydes and ketones. It reacts selectively with carbonyl groups to form stable hydrazone derivatives that are amenable to analysis by high-performance liquid chromatography (HPLC) or mass spectrometry (MS). Its sulfophenyl and ester functionalities enhance water solubility and improve chromatographic behavior, making it suitable for biological and environmental sample analysis. Commonly applied in metabolic profiling, oxidative stress studies, and air quality monitoring where sensitive detection of reactive carbonyl species is required.