17289
A critical study of the use of the Fe ( III ) / 3 - hydroxy - 4 - nitroso - 2 , 7 - naphthalenedisulfonic acid ( NRS ) complexes on the quantification of the polyphenols content in aqueous extracts of plants , expressed as pyrogallic acid , [ PA ] , is presented .
 Chemical: Fe ( III ); Chemical: 3 - hydroxy - 4 - nitroso - 2 , 7 - naphthalenedisulfonic acid; Chemical: NRS; Chemical: polyphenols; Chemical: pyrogallic acid
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Fe ( III ), 3 - hydroxy - 4 - nitroso - 2 , 7 - naphthalenedisulfonic acid, NRS, polyphenols, pyrogallic acid 
Answer:
 Chemical: Fe ( III ); Chemical: 3 - hydroxy - 4 - nitroso - 2 , 7 - naphthalenedisulfonic acid; Chemical: NRS; Chemical: polyphenols; Chemical: pyrogallic acid