K. Nair, Deepa, et al. “Synthesis and Evaluation of Ibuprofen Conjugate With Salicylamide and Its Mannich Bases for Analgesic and Antiinflammatory Activities”. Asian Journal of Chemistry, vol. 17, no. 2, Jan. 2016, pp. 943-8, https://asianpubs.org/index.php/ajchem/article/view/14331.