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MATERIALS AND METHODS : In this study , we examined the proposed penetration enhancing properties of spilanthol , an N - alkylamide abundantly present in several Asteraceae plants like Spilanthes acmella L . , on three model drugs ( caffeine , testosterone and ibuprofen ) .
 Chemical: spilanthol; Chemical: N - alkylamide; Chemical: caffeine; Chemical: testosterone; Chemical: ibuprofen
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: spilanthol; Chemical: N - alkylamide; Chemical: caffeine; Chemical: testosterone; Chemical: ibuprofen