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The most important phenols in apple are epicatechin , catechin and their polymeric structures , which have been identified as substrates of the polyphenoloxidase ( PPO ) .
 Chemical: phenols; Chemical: epicatechin; Chemical: catechin
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: phenols; Chemical: epicatechin; Chemical: catechin