Shafiq1, Muhammad, et al. “Synthesis and Antifungal Activity of Halogen-Substituted 2,1-Benzothiazine-2,2-Dioxide Derivatives”. Asian Journal of Chemistry, vol. 23, no. 5, Jan. 2011, pp. 2101-5, https://asianpubs.org/index.php/ajchem/article/view/10312.