19567
Following inhalation , the observed median time to maximum plasma concentrations ( 25 % , 75 % ) was 1 . 89 ( 1 . 45 , 3 . 08 ) minutes and the mean ( SD ) elimination half - life was 1 . 24 ( 0 . 24 ) hours .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None