3838
That propranolol antagonizes the pressor effect of PPA is in contrast to the interaction in which propranolol enhances the pressor effect of norepinephrine .
 Chemical: propranolol; Chemical: PPA; Chemical: propranolol; 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: propranolol; Chemical: PPA; Chemical: propranolol; Chemical: norepinephrine