Used primarily as a reference standard in pharmaceutical quality control for the identification and quantification of impurities in levocarnitine-based drug formulations. It ensures the purity and safety of final products by helping detect trace levels of specific degradation byproducts during stability testing. Commonly employed in HPLC and LC-MS analytical methods to validate the manufacturing process and comply with regulatory requirements set by pharmacopoeias such as the European Pharmacopoeia (EP).