8630
In this study we show that in rats paraxanthine has a stronger locomotor activating effect than caffeine or the two other main metabolites of caffeine , theophylline and theobromine .
 Chemical: paraxanthine; Chemical: caffeine; Chemical: caffeine; Chemical: theophylline; Chemical: theobromine
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: caffeine; Chemical: theophylline; Chemical: theobromine