909
In contrast , both methscopolamine and neostigmine , which do not penetrate the blood - brain barrier , had no effect on the hyperactivity produced by morphine .
 methscopolamine, neostigmine, hyperactivity, morphine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 methscopolamine, neostigmine, hyperactivity, morphine