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The keto and phenolic - OH are major factors that are prominently involved in interaction with COX - 2 active site .
 Chemical: keto; Chemical: phenolic; Chemical: OH
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: keto, phenolic, OH 
Answer:
 Chemical: keto; Chemical: phenolic; Chemical: OH