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The high density of A1 adenosine receptors in the brain results in significant potential for central nervous system ( CNS ) - related adverse effects with A1 agonists .
 Chemical: adenosine
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: adenosine