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Tran, T.; Duong, T.; Luu, X. T. 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. VNUHCM Journal of Natural Sciences 2024, 8, 3190-3197.