6916
We have synthesized a series of potent FAAH inhibitors encompassing two classes of N - alkyl - O - arylcarbamates and radiolabeled eight of them with carbon - 11 .
 Chemical: N - alkyl - O - arylcarbamates; Chemical: carbon - 11
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: N - alkyl - O - arylcarbamates; Chemical: carbon - 11