19565
Forty participants received 0 . 5 , 1 , 2 , or 4 mg zaleplon or placebo as a thermally generated aerosol in a randomized , double - blind , parallel - group , dose escalation study .
 Chemical: zaleplon
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: zaleplon