Zare A, Khanivar R, Merajoddin M, et al. Triethylamine-bonded sulfonic acid {[Et3N-SO3H]Cl} as an efficient and homogeneous catalyst for the synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-ones. Iran. J. Catal. 2024;2(3). Accessed May 10, 2026. https://oiccpress.com/ijc/article/view/3731