15261
Finally , compounds derived from the xanthine scaffold afford neuroprotection in Parkinson ' s disease through mechanisms that include dual adenosine A2A receptor antagonism and MAO - B inhibition .
 Chemical: xanthine; 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: xanthine; Chemical: adenosine