2-oxo-3-(5-oxofuran-2-ylidene)propanoate lactonase activity
2-oxo-3-(5-oxofuran-2-ylidene)propanoate lactonase activity
Catalysis of the reaction: 2-oxo-3-(5-oxofuran-2-ylidene)propanoate + H2O = 3-maleylpyruvate + H+.