26248
Results : The obtained chitosan - thiobutylamidine conjugate displayed 647 . 4 +/- 85 . 23 micro mol / g immobilized thiol groups .
 Chemical: thiobutylamidine
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: thiobutylamidine