Pharmaceutical analysis- identification and quantification of impurities in azithromycin. Quality control labs- method development and validation (e.g. HPLC). Stability studies- monitoring degradation of azithromycin products.

To ensure impurity levels are within pharmacopeial limits. Support regulatory compliance. Verify the purity safety and quality of azithromycin formulations.

It is a known degradation or process-related impurity that may form during synthesis or storage of the drug. It is used as a certified reference standard in analytical testing.