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For testosterone , a maximal penetration enhancing concentration of 0 . 5 % spilanthol was found ( ER = 4 . 13 ) .
 Chemical: testosterone; Chemical: spilanthol
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: testosterone; Chemical: spilanthol