The enzyme fucosterol-epoxide lyase () catalyzes the chemical reaction
This enzyme belongs to the family of lyases, specifically the aldehyde-lyases, which cleave carbon-carbon bonds. The systematic name of this enzyme class is (24R,24'R)-fucosterol-epoxide acetaldehyde-lyase (desmosterol-forming). This enzyme is also called (24R,24'R)-fucosterol-epoxide acetaldehyde-lyase.