2154
Basal expression and cellular antioxidant activity , including SOD , CAT , and GSH , were examined prior to H ( 2 ) O ( 2 ) and ~ 30 nm SiO ( 2 ) ( 0 . 01 - 100mg / L ) exposures .
 GSH, H ( 2 ) O ( 2 ), SiO ( 2 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 GSH, H ( 2 ) O ( 2 ), SiO ( 2 )