2-oxopent-4-enoate hydratase; 2-keto-4-pentenoate hydratase; OEH; 2-keto-4-pentenoate (vinylpyruvate)hydratase; 4-hydroxy-2-oxopentanoate hydro-lyase; 4-hydroxy-2-oxopentanoate hydro-lyase (2-oxopent-4-enoate-forming); mhpD (gene name); ahdF (gene n • • •