APST-ZA丨CAS 635705-72-5

The compound known as APST‑ZA (CAS 635705‑72‑5) - also referred to as Des‑acetyl Apremilast or N‑Desacetyl Apremilast - is used primarily in pharmaceutical research and manufacturing as an impurity reference standard or intermediate related to the active drug Apremilast. Laboratories and manufacturers use APST‑ZA to monitor, identify, and quantify impurities during drug synthesis or degradation studies, especially in quality control and analytical method development. It is often employed in method validation, stability testing, and as a benchmark for regulatory submissions (for instance, when establishing impurity profiles for drug batches).

Using APST‑ZA as a reference impurity standard offers significant advantages in ensuring the safety, purity, and consistency of pharmaceutical products. It allows precise detection and quantification of trace-level impurities in batches of Apremilast, ensuring that any degradation, by-products, or unintended compounds remain within acceptable limits. This contributes to rigorous quality assurance, supports compliance with pharmacopeial and regulatory standards, and helps maintain batch-to-batch uniformity. In research contexts, having a characterized impurity like APST‑ZA aids in analytical method development, validation, and in exploring metabolic or degradation pathways relevant to drug safety and efficacy.