20670
On the basis of percent edema inhibition after 3 h of carrageenin injection , n - butanol fraction showed promising activity through a significant ( p < 0 . 05 ) decrease in paw volume by 85 . 6 % from control using indomethacin as reference standard .
 Chemical: n - butanol; Chemical: indomethacin
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 - butanol; Chemical: indomethacin