1659
Psychostimulants such as mixed amphetamine salts ( MAS , brand name Adderall ) are widely used for cognitive enhancement by healthy young people , yet laboratory research on effectiveness has yielded variable results .
 Chemical: amphetamine; Chemical: Adderall
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: amphetamine; Chemical: Adderall