23504
The vasorelaxant effect of MPG extract was studied on rat arterial rings pre - contracted with phenylephrine ( 1 mu M ) in the presence or absence of the endothelium .
 Chemical: phenylephrine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: phenylephrine