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Hirsutenone effectively protected RGC - 5 cells from oxidative insult induced by , l - buthionine - ( S , R ) - sulfoximine ( BSO ) plus glutamate in a concentration - dependent manner , as demonstrated by propidium iodide ( PI ) / Hoechst 33342 double staining , flow cytometry , and MTT assays .
 l - buthionine - ( S , R ) - sulfoximine, BSO, glutamate, propidium iodide, MTT
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 l - buthionine - ( S , R ) - sulfoximine, BSO, glutamate, propidium iodide, MTT