29859
The best derivative was N - ( 4 - oxo - 4H - 3 , 1 - benzothiazin - 2 - yl ) - 4 - phenylbutanamide ( 17 , Ki human A2A 39 . 5 nM , IC50 human MAO - B 34 . 9 nM ; selective versus other AR subtypes and MAO - A ) , which inhibited A2AAR - induced cAMP accumulation and showed competitive , reversible MAO B inhibition .
 N - ( 4 - oxo - 4H - 3 , 1 - benzothiazin - 2 - yl ) - 4 - phenylbutanamide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 N - ( 4 - oxo - 4H - 3 , 1 - benzothiazin - 2 - yl ) - 4 - phenylbutanamide