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Three new monoterpene lactones , cimicifugolides A - C ( 1 - 3 ) , along with a known one ( 4 ) , were identified from the dried rhizome of Actaea cimicifuga L . that was used as traditional Chinese medicine for thousands of years with the Chinese common name of shengma .
 monoterpene lactones, cimicifugolides A - C
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
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Answer:
 monoterpene lactones, cimicifugolides A - C