Noor S. Hashim and M. S Farhan, “Synthesis, Characterization, and  Preliminary Evaluation of  Biological Activity of 6-Mercaptopurine Heterocyclic Derivatives”, Iraqi Journal of Pharmaceutical Sciences , vol. 34, no. 2, pp. 197–205, Jun. 2025, doi: 10.31351/vol34iss2pp197-205.