6419
Fluorescent derivatives of adenosine agonists and antagonists ( e . g . XAC and other heterocyclic antagonist scaffolds ) have been synthesized and characterized pharmacologically .
 Chemical: adenosine; Chemical: XAC
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; Chemical: XAC