Constituent of peppermint oil used in decongestants (7)

I believe the answer is:

menthol

(Other definitions for menthol that I've seen before include "Minty substance" , "Chemical compound that smells like mint" , "Peppermint camphor" , "Soothing substance from peppermint" , "Peppermint oil derivative" .)

I've seen this clue in The Times.

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