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Khaligh, Nader Ghaffari and Lim, Shi Teng and Ong, Chiu Ling and Johan, Mohd Rafie and Juan, Joon Ching (2019) 4-Imidazol-1-yl-butane-1-sulfonic acid or a novel liquid salt? The NMR analysis and dual solvent-catalytic efficiency for one-pot synthesis of xanthenes. Journal of Molecular Liquids, 278. pp. 19-32. ISSN 0167-7322, DOI https://doi.org/10.1016/j.molliq.2019.01.041.