Ding, Cong-Wen, Yue-Feng Zhang, and Hai-Feng Yu. “A Novel and Green Method for the Synthesis of Benzo-15-Crown-5 Containing Sulphonylthiourea-Based Receptors”. Asian Journal of Chemistry 25, no. 11 (June 6, 2013): 6237–6239. Accessed June 30, 2024. https://asianpubs.org/index.php/ajchem/article/view/25_12_84.