15607
Acitretin - induced MPT was not prevented by thiol group protecting and antioxidant agents , excluding the involvement of oxidative stress mechanisms .
 Chemical: Acitretin; Chemical: thiol
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: Acitretin; Chemical: thiol