8635
Ex vivo experiments demonstrated that paraxanthine , but not caffeine , can induce cGMP accumulation in the rat striatum .
 Chemical: paraxanthine; Chemical: caffeine; Chemical: cGMP
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: paraxanthine; Chemical: caffeine; Chemical: cGMP