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Safaei-Ghomi, J. et al. (2017). Chitosan functionalized by citric acid: an efficient catalyst for one-pot synthesis of 2, 4-diamino-5H-[1]benzopyrano[2, 3-b]pyridine-3-carbonitriles 5-(arylthio) or 5-[(arylmethyl)thio] substituted. Journal of sulfur chemistry. pp. 236-248. [Online].