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The proton NMR spectra of several 1 , 2 - diols in benzene have been analysed so as to associate each magnetically nonequivalent proton with its chemical shift .
 Chemical: 1 , 2 - diols; Chemical: benzene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 1 , 2 - diols; Chemical: benzene