28104
Finally , N - propylacetamide derivative ( 31b ) was determined as a potent inhibitor for both PDE4B ( IC50 = 7 . 5nM ) and TNF - alpha production in mouse splenocytes ( IC50 = 9 . 8nM ) and showed good in vivo anti - inflammatory activity in the LPS - induced lung inflammation model in mice ( ID50 = 18mg / kg ) .
 N - propylacetamide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 N - propylacetamide