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The aim of this study was to determine whether NAC could counter in vitro hepatocyte injury induced by DDT or its two major metabolites , dichlorodiphenyldichloroethylene and dichlorodiphenyldichloroethane .
 Chemical: NAC; Chemical: DDT; Chemical: dichlorodiphenyldichloroethylene; Chemical: dichlorodiphenyldichloroethane
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: NAC; Chemical: DDT; Chemical: dichlorodiphenyldichloroethylene; Chemical: dichlorodiphenyldichloroethane