3839
This is probably because PPA has less beta 2 activity than does norepinephrine .
 Chemical: PPA; Chemical: norepinephrine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: PPA; Chemical: norepinephrine