K. Singh, Rajesh, et al. “Synthesis, Alkylation Activity and Physico-Chemical Evaluation of Benzodiazepine Linked Nitrogen Mustard Agent to Penetrate the Blood-Brain Barrier”. Asian Journal of Chemistry, vol. 24, no. 12, Aug. 2012, pp. 5605-8, https://asianpubs.org/index.php/ajchem/article/view/9948.