3001
Conversely , brain normetanephrine concentration was increased from saline control by amantadine in the BALB / C mice .
 normetanephrine, amantadine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 normetanephrine, amantadine