Tran, T., Duong, T. and Luu, X.T. 2025. The novel and green synthesis of 6-amino-4-phenyl-2-thioxo-1,2,3,4-tetrahydropyrimidine-5-carbonitrile via the solvent-free biginelli multi-component reaction catalysed by Choline chloride/2ZnCl2. Science & Technology Development Journal: Natural Sciences. 8, 4 (Feb. 2025), In press. DOI:https://doi.org/https://doi.org/10.32508/stdjns.v8i4.1370.