4-desfluoro 3-oxobutanoate methyl ester Impurity

4-desfluoro 3-oxobutanoate methyl ester Impurity product with CAS: NA is also known as Methyl 4-(2,5-difluorophenyl)-3-oxobutanoate. 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 3-oxobutanoate methyl ester Impurity is generally used for Quality Control (QC), Quality Assurance (QA) during commercial production of Sitagliptin and its related formulations. Moreover, Methyl 4-(2,5-difluorophenyl)-3-oxobutanoate is also used in the process of Abbreviated New Drug Application (ANDA) filing to FDA and toxicity study of respective drug formulation.