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A number of cognitive enhancing agents , including galantamine , modafinil , atomoxetine , methylphenidate , and guanfacine , have shown promising findings in human studies .
 Chemical: galantamine; Chemical: modafinil; Chemical: atomoxetine; Chemical: methylphenidate; Chemical: guanfacine
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: galantamine; Chemical: modafinil; Chemical: atomoxetine; Chemical: methylphenidate; Chemical: guanfacine