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Caffeine is metabolized to several methylxanthines , with paraxanthine being the main metabolite in humans .
 Chemical: Caffeine; Chemical: methylxanthines; Chemical: paraxanthine
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: Caffeine; Chemical: methylxanthines; Chemical: paraxanthine