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We also tested the suitability of a glutathione conjugate of DCBN ( GS - DCBN ) or its derivatives as biomarkers of DCBN exposure and nasal toxicity in mouse models .
 glutathione, DCBN, DCBN, DCBN
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 glutathione, DCBN, DCBN, DCBN