Ashok, D., E.V.L. Madhuri, and M. Sarasija. “Green Synthesis of Spiropyranone 3-Aryl-4-Methylcoumarin Derivatives Using Carbonyldiimidazole”. Asian Journal of Chemistry 32, no. 1 (September 18, 2019): 205–208. Accessed June 24, 2026. https://asianpubs.org/index.php/ajchem/article/view/36560.