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Menthol , a natural product of the peppermint plant Mentha x piperita ( Lamiaceae ) , is a monoterpene which is widely used as a natural product in cosmetics , a flavoring agent , and as an intermediate in the production of other compounds .
 Menthol, monoterpene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Menthol, monoterpene