15663
Due to the harsh conditions required to produce 11 and 12 , it is expected that their levels in flax based foods would be low and therefore their presence could serve as an indicative measure of severe oxidation of a food product .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None