19862
Reversible gelation and dissolution are achieved both in dimethylformamide and in aqueous medium via a thiol - disulphide interconversion in the side chain of the polymers .
 Chemical: dimethylformamide; Chemical: thiol - disulphide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: dimethylformamide; Chemical: thiol - disulphide