2022. New Tetra-dentate Schiff Base Ligand N2O2 and Its Complexes with Some of Metal Ions: Preparation, Identification, and Studying Their Enzymatic and Biological Activities. Baghdad Science Journal. 19, 1 (Feb. 2022), 0155. DOI:https://doi.org/10.21123/bsj.2022.19.1.0155.