. "Catalysis of the reaction: 2,5-dihydro-5-oxofuran-2-acetate = 3,4-dihydro-5-oxofuran-2-acetate." . . "muconolactone delta-isomerase activity" . "5-oxo-4,5-dihydrofuran-2-acetate delta3-delta2-isomerase activity" . "muconolactone D-isomerase activity" . "muconolactone isomerase activity" . . .