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The first line vasopressor recommended at present is norepinephrine , while vasopressin can be started as a salvage therapy for those not responding to catecholamines .
 norepinephrine, catecholamines
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 norepinephrine, catecholamines