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To our knowledge , there is no previous report regarding whether domperidone , a peripheral dopamine D2 receptor antagonist , can also induce or aggravate symptoms of RLS .
 Chemical: domperidone; Chemical: dopamine; Disease: RLS
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: domperidone; Chemical: dopamine; Disease: RLS