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In presence of HACs ( 10 ( - 9 ) mol / plate ) , C . lechleri essential oil was tested for mutagen - protective properties ( concentration range : 0 . 01 - 0 . 10mg / plate ) taking the Highest Uneffective Dose ( HUD ) as threshold reference .
 Chemical: HACs
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: HACs