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9 , 10 - seco - 9 , 19 - cyclolanostane triterpene from Salix caprea L .
 9 , 10 - seco - 9 , 19 - cyclolanostane, triterpene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 9 , 10 - seco - 9 , 19 - cyclolanostane, triterpene