4-desfluoro N-Boc methyl ester Impurity

4-desfluoro N-Boc methyl ester Impurity product with CAS: NA is also known as (R)-Methyl 3-(tert-butoxycarbonylamino)-4-(2,5-difluorophenyl)butanoate. This product can be used as a working standard or secondary reference standard. Additional internal validation as per respective FDA regulations/guidelines may require. 4-desfluoro N-Boc methyl ester Impurity is generally used for Quality Control (QC), Quality Assurance (QA) during commercial production of Sitagliptin and its related formulations. Moreover, (R)-Methyl 3-(tert-butoxycarbonylamino)-4-(2,5-difluorophenyl)butanoate is also used in the process of Abbreviated New Drug Application (ANDA) filing to FDA and toxicity study of respective drug formulation.