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To our knowledge , this is the first study to report the steroidal saponins in the plant S . uncinata and demonstrate their protective effect against anoxia in PC12 cell assay .
 steroidal saponins
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 steroidal saponins