4504
For PA extension subunits , changes in epigallocatechin were inversely correlated with epicatechin and epicatechin - 3 - O - gallate .
 epigallocatechin, epicatechin, epicatechin - 3 - O - gallate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 epigallocatechin, epicatechin, epicatechin - 3 - O - gallate