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Maximum contraction of vena cava to norepinephrine ( 37 % control ) also was reduced but no change in response to ET - 1 was observed .
 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: norepinephrine