In enzymology, a linoleate isomerase is an enzyme that catalyzes the chemical reaction 9-cis,12-cis-octadecadienoate ⇌ {\displaystyle \rightleftharpoons } 9-cis,11-trans-octadecadienoateHence, this enzyme has one substrate, 9-cis,12-cis-octadecadienoate, and one product, 9-cis,11-trans-octadecadienoate. Wikipedia