18440
This is consistent with experimental data showing slowly reversible FAAH inhibition for the N - piperazinylurea inhibitor and irreversible inhibition for URB597 .
 Chemical: N - piperazinylurea; Chemical: URB597
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 - piperazinylurea; Chemical: URB597