The enzyme bile-acid 7ñ-dehydratase () catalyzes the chemical reaction
This enzyme belongs to the family of lyases, specifically the hydro-lyases, which cleave carbon-oxygen bonds. The systematic name of this enzyme class is 7ñ,12ñ-dihydroxy-3-oxochol-4-enoate hydro-lyase (12ñ-hydroxy-3-oxochola-4,6-dienoate-forming). This enzyme is also called 7ñ,12ñ-dihydroxy-3-oxochol-4-enoate hydro-lyase.