Bin-Selim, E.A. and Ismail, R.M. 2026. INVESTIGATION OF BASICITY AND PROTONATED SITES OF SOME COUMARIN DERIVATIVES A DFT STUDY. Electronic Journal of University of Aden for Basic and Applied Sciences. 7, 1 (Mar. 2026), 109–117. DOI:https://doi.org/10.47372/ejua-ba.2026.1.504.