In enzymology, an ñ-pinene-oxide decyclase () is an enzyme that catalyzes the chemical reaction
Hence, this enzyme has one substrate, ñ-pinene oxide, and one product, (Z)-2-methyl-5-isopropylhexa-2,5-dienal.
This enzyme belongs to the family of isomerases, specifically the class of intramolecular lyases. The systematic name of this enzyme class is ñ-pinene-oxide lyase (decyclizing). This enzyme is also called ñ-pinene oxide lyase. This enzyme participates in limonene and pinene degradation.