Rao, L. Hanmanth, Mogili Padma, Abhishek Shankar Saxena, and Srinu Karnati. “Synthesis and Characterisation of Critical Impurities in Ampicillin Trihydrate: N-Formyl Ampicilloic Acid and D-Phenylglycylampicillin”. Asian Journal of Chemistry 38, no. 2 (January 31, 2026): 517–521. Accessed February 2, 2026. https://asianpubs.org/index.php/ajchem/article/view/38_2_25.