Fahim, A. M.; Farag, A. M.; Shaaban, M. R.; Ragab, E. A. Synthesis and DFT Study of Novel Pyrazole, Thiophene, 1,3-Thiazole and 1,3,4-Thiadiazole Derivatives. Eur. J. Chem. 2018, 9, 30-38.