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The present study showed that 4 - thujanol was unable to reduce the genetic damage induced by MMC , in the absence of S9 mix .
 Chemical: 4 - thujanol; Chemical: MMC
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: 4 - thujanol; Chemical: MMC