Moosavi-Zare AR, Afshar-Hezarkhani H. N-sulfonic acid pyridinium-4-carboxylic acid chloride as a novel and efficient catalyst for the condensation reaction of aldehyde with thiobarbituric acid and ammonium acetate. Iran. J. Catal. 2024 Feb. 3;10(2). Available from: http://oiccpress.com/ijc/article/view/3551