Liu, Yiyang. “Comparative Study on Lewis Acid Catalyzed Biginelli Reaction for the Synthesis of 3,4-Dihydropyrimidin-2(1H)-Thione”. Science and Technology of Engineering, Chemistry and Environmental Protection 3, no. 4 (August 26, 2025): 10112. Accessed November 4, 2026. https://stecep.deanfrancis.press/article/view/776.