23162
This led us to propose tentative mechanisms for the previously reported formation of trans isomers of the active thiol metabolite of clopidogrel upon microsomal metabolism of this antithrombotic in the presence of thiols .
 Chemical: thiol; Chemical: clopidogrel; Chemical: thiols
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: thiol, clopidogrel, thiols 
Answer:
 Chemical: thiol; Chemical: clopidogrel; Chemical: thiols