Sami, M.H. and Younis, S.K. 2022. Selective approaches to synthesize a new series of fused 4-amino pyrimidine derivatives by using of 4- amino nicotino nitrile as an effective precursor. International journal of health sciences. 6, S9 (Sep. 2022), 2832–2843. DOI:https://doi.org/10.53730/ijhs.v6nS9.13134.