828
The highest DPPH radical scavenging activity was found for N . crassifolia , with IC50 values of 9 . 6 and 12 . 1 micro g / mL for ethyl acetate and n - butanol fractions , respectively .
 DPPH, ethyl acetate, n - butanol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 DPPH, ethyl acetate, n - butanol