Deep eutectic solvents formed between choline chloride and carboxylic acids: versatile alternatives to ionic liquids.
Abbott AP, Boothby D, Capper G, Davies DL, Rasheed RK. Deep eutectic solvents formed between choline chloride and carboxylic acids: versatile alternatives to ionic liquids. J Am Chem Soc. 2004 Jul 28; 126(29):9142-7.