26244
Methods : 2 - iminothiolane was covalently attached to a chitosan backbone .
 Chemical: 2 - iminothiolane
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: 2 - iminothiolane 
Answer:
 Chemical: 2 - iminothiolane