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Hussein, K.A.A. and Kassium, Y.A. 2021. Synthesis and characterization of some New 2- and 6- substituted of 5- Acetyl - 4- (P- phenyl) Pyrimidine and substituted thieno [2, 3- d] Pyrimidine. University of Aden Journal of Natural and Applied Sciences. 25, 2 (Oct. 2021), 273–282. DOI:https://doi.org/10.47372/uajnas.2021.n2.a05.