2891
Vilanterol represented a very small percentage ( < 0 . 5 % ) of the total drug - related material in plasma , indicative of extensive first - pass metabolism .
 Chemical: Vilanterol
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: Vilanterol