Used primarily as a reference standard in pharmaceutical quality control, this impurity helps in the identification and quantification of degradation products during the stability testing of amlodipine-based medications. It supports the validation of analytical methods such as HPLC and LC-MS to ensure drug purity, safety, and consistency in manufacturing processes. Its presence is monitored to assess the efficacy and shelf life of calcium channel blocker formulations used in treating hypertension and angina.