22701
In addition , the cumulative nociceptive response time for intraplantar formalin injection ( 2nd phase ) , intrathecal injection of substance P ( 0 . 7 mu g ) or glutamate ( 20 mu g ) was diminished by oleanolic acid .
 glutamate, oleanolic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 glutamate, oleanolic acid