8572
Additionally , SKN - caused cell death was reversed by a reactive oxygen species ( ROS ) scavenger N - acetylcysteine ( NAC ) whereas TNF alpha - mediated necrosis was successfully protected by butylated hydroxyanisole ( BHA ) , implying that ROS may be differentially derived from death inducing agents .
 Chemical: SKN; Chemical: oxygen; Chemical: N - acetylcysteine; Chemical: NAC; Chemical: butylated hydroxyanisole; Chemical: BHA
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: SKN; Chemical: oxygen; Chemical: N - acetylcysteine; Chemical: NAC; Chemical: butylated hydroxyanisole; Chemical: BHA