Murugesh, K., et al. “Synthesis and Pharmacological Activities of 2,3,4,10-Tetrahydro-3,10-Dioxo-2-(substituted Phenyl)-[1,2,4]triazino[4,3-a]indoles”. Asian Journal of Chemistry, vol. 17, no. 3, May 2016, pp. 1641-5, https://asianpubs.org/index.php/ajchem/article/view/14094.