“Synthesis and Characterization of 2, 4-Dihydroxy Substitted Chalcones Using PEG-400 As a Recyclable Solvent”. Global Journal of Science Frontier Research 10, no. 6 (October 11, 2010): -. Accessed August 6, 2026. https://journalofscience.org/index.php/GJSFR/article/view/184.