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Dopamine D 2 - agonist rotigotine effects on cortical excitability and central cholinergic transmission in Alzheimer ' s disease patients .
 Chemical: Dopamine; Chemical: rotigotine
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: Dopamine; Chemical: rotigotine