27819
In an in vivo rat model of OA pain , compound 22 had significant analgesic activity 1 and 3h after a single , 10mg / kg , subcutaneous dose .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None