Cong, N. T.; Hung, M. A.; Nam, P. N.; Kim Loan, N. T. Synthesis of 5,7-Dimethyl-[1,2,4]triazolo[1,5-a]pyrimidine-2-Thiol and Derivatives via (4,6-Dimethylpyrimidin-2-ylsulfanyl)acetohydrazide. VJChem 2014, 52, 148.