7235
On the other hand , peptides modified with ( 2S , 4R ) - 4 - ( naphthalene - 2 - ylmethyl ) pyrrolidine - 2 - carboxylic acid , apart from their moderate antioxytocic activity , turned out to be weak antagonists of the pressor response to arginine vasopressin .
 ( 2S , 4R ) - 4 - ( naphthalene - 2 - ylmethyl ) pyrrolidine - 2 - carboxylic acid, arginine vasopressin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( 2S , 4R ) - 4 - ( naphthalene - 2 - ylmethyl ) pyrrolidine - 2 - carboxylic acid, arginine vasopressin