Choline chloride (C 5 H 14 ClNO) and N,N-diethylenethanol ammonium chloride (C 6 H 16 ClNO) as quaternary ammonium salts as well as triethylene glycol (C 6 H 14 O 4 ), glycerol (C 3 H 8 O 3 ) and ethylene glycol (C 2 H 6 O 2 ) as hydrogen bond donors were obtained from Merck Chemicals (Germany) with high purity (≥ 98%) and were used as-received.
Source: wiktionary