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In this study , we present the synthesis and pharmacological properties of new analogues of arginine vasopressin modified in the N - terminal part of the molecule with proline derivatives : indoline - 2 - carboxylic acid ( Ica ) and ( 2S , 4R ) - 4 - ( naphthalene - 2 - ylmethyl ) pyrrolidine - 2 - carboxylic acid .
 arginine vasopressin, N, proline, indoline - 2 - carboxylic acid, Ica, ( 2S , 4R ) - 4 - ( naphthalene - 2 - ylmethyl ) pyrrolidine - 2 - carboxylic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 arginine vasopressin, N, proline, indoline - 2 - carboxylic acid, Ica, ( 2S , 4R ) - 4 - ( naphthalene - 2 - ylmethyl ) pyrrolidine - 2 - carboxylic acid