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Furthermore , the biliary excretion index ( BEI ) of formed M1 - glucuronide in rat SCH ( 25 . 8 - 50 . 9 % ) was higher than that in human SCH ( 15 . 1 - 16 . 7 % ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None