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
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: thiol; Chemical: clopidogrel; Chemical: thiols