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The importance of dipole - dipole interaction between an amino - acid chain and hydroxyl group at the benzene ring was also discussed .
 Chemical: amino - acid; Chemical: hydroxyl; 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: amino - acid; Chemical: hydroxyl; Chemical: benzene