2018. Synthesis , Characterization and Study of Biological Activity of Some New Schiff Bases ,1,3-Oxazepine and Tetrazole Derived from 2,2 di thiophenyl Acetic Acid. Ibn AL-Haitham Journal For Pure and Applied Sciences. 31, 1 (May 2018), 189–202. DOI:https://doi.org/10.30526/31.1.1866.