17288
A critical study of use of the Fe ( II ) / 3 - hydroxy - 4 - nitroso - 2 , 7 - naphthalenedisulfonic acid complexes in the quantification of polyphenols in medicinal plants .
 Fe ( II ), 3 - hydroxy - 4 - nitroso - 2 , 7 - naphthalenedisulfonic acid, polyphenols
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Fe ( II ), 3 - hydroxy - 4 - nitroso - 2 , 7 - naphthalenedisulfonic acid, polyphenols