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We investigated the composition of essential oil from fingered citron ( Citrus medica L . var . sarcodactylis ) ( FCEO ) peels by GC - MS and its anti - inflammatory effects on lipopolysaccharide ( LPS ) - stimulated mouse macrophage ( RAW 264 . 7 ) cells .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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