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We characterized the oxidative stress ( OS ) status by the levels of reduced / oxidized glutathione ( GSH / GSSG ) , malondialdehyde ( MDA ) and the mutagenic base 8 - oxo - 7 ' 8 - dihydro - 2 ' - deoxyguanosine ( 8 - oxo - dG ) in human gastric carcinoma ( HGC ) samples and compared the results with normal tissue from the same patients .
 Chemical: reduced / oxidized glutathione; Chemical: GSH; Chemical: GSSG; Chemical: malondialdehyde; Chemical: MDA; Chemical: 8 - oxo - 7 ' 8 - dihydro - 2 ' - deoxyguanosine; Chemical: 8 - oxo - dG
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: reduced / oxidized glutathione; Chemical: GSH; Chemical: GSSG; Chemical: malondialdehyde; Chemical: MDA; Chemical: 8 - oxo - 7 ' 8 - dihydro - 2 ' - deoxyguanosine; Chemical: 8 - oxo - dG