15603
However , cases of acitretin - associated liver injury have been documented , but the possible mechanisms of acitretin - associated hepatotoxicity and apoptosis are not entirely clarified .
 Chemical: acitretin; Chemical: acitretin
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: acitretin