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Swaroop, T. R. and Sharath Kumar, K. S. and Palanivelu, M. and Chaitanya, S. and Rangappa, K. S. (2014) A catalyst-free green protocol for the synthesis of pyranopyrazoles using room temperature ionic liquid choline chloride-urea. Journal of Heterocyclic Chemistry, 51 (6). pp. 1866-1870.