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By contrast , the ( 15 ) N relaxation experiments revealed a conformational exchange at the alpha sugar - binding site in the sugar - free state , which was suppressed in the lactose - bound state .
 Chemical: ( 15 ) N; Chemical: sugar; Chemical: sugar; Chemical: lactose
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: ( 15 ) N; Chemical: sugar; Chemical: sugar; Chemical: lactose