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This developed method provides good linearity ( r > 0 . 9993 ) , intra - and inter - day precisions ( RSD < 4 . 18 % ) , repeatability ( RSD < 5 . 05 % ) , stability ( RSD < 2 . 08 % ) and recovery ( 93 . 82 - 102 . 84 % ) for three steroidal saponins .
 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