5554
N - acetyl cysteine ( NAC ) , a glutathione ( GSH ) precursor and silymarin ( SIL ) , a naturally occurring antioxidant , encounter oxidative stress - mediated cellular damage .
 Chemical: N - acetyl cysteine; Chemical: NAC; Chemical: glutathione; Chemical: GSH
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: N - acetyl cysteine; Chemical: NAC; Chemical: glutathione; Chemical: GSH