Acts on (-)-trans-isopiperitenol, (+)-trans-piperitenol and (+)-trans-pulegol. Involved in the biosynthesis of menthol and related monoterpenes in peppermint (Mentha piperita) leaves.
Metabolism of monoterpenes: oxidation of isopiperitenol to isopiperitenone, and subsequent isomerization to piperitenone by soluble enzyme preparations from peppermint (Mentha piperita) leaves.