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Additionally , the combination of acitretin with other drugs , such as antiestrogens , which are able to inhibit the MPT , may contribute to decrease the toxicity induced by acitretin .
 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