N-Acetyl-D-penicillamine is a specialty chemical reagent primarily used as a derivatizing agent in high-performance liquid chromatography (HPLC) for the analysis of thiols, amino acids, and related compounds. It reacts to form stable, fluorescent or UV-detectable derivatives, improving sensitivity and selectivity in detection. This product is suitable for analytical and research applications, with a purity of ≥99.0% (titration). Note: It is a derivative of penicillamine and not intended for direct therapeutic use.