Hassaneen, H., Abunada, N., Miqdad, O., & Fares, A. (2011). Synthesis of Some New 1,3-Disubstituted-4,9-dithia-1,2,6-triazaspiro[4,4]nonan-2-ene-7- one: Site Selectivity in Reactions of Nitrilimines with Polyfunctional Dipolarophile. Asian Journal of Chemistry, 24(1), 330–334. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/16014