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We also report the structures of the K165C variant , and the K165 - gamma - thialysine enzyme in the presence , or absence , of pyruvate .
 gamma - thialysine, pyruvate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 gamma - thialysine, pyruvate