Al-Hamdany, R., & A. Fataftah, Z. (2010). Condensation of o-Phthalaldehydic Acid with Dihydroxy Benzenes, Part VII: Synthesis of 3-(Dihydroxyphenyl) Phthalides and their Nitration Reactions . Asian Journal of Chemistry, 9(4), 703–709. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/23950