. "Catalysis of the reaction: 2,5-dihydro-5-oxofuran-2-acetate = cis,cis-hexadienedioate." . . "muconate cycloisomerase activity" . "2,5-dihydro-5-oxofuran-2-acetate lyase (decyclizing)" . "4-carboxymethyl-4-hydroxyisocrotonolactone lyase (decyclizing)" . "cis,cis-muconate cycloisomerase activity" . "cis,cis-muconate lactonizing enzyme I activity" . "cis,cis-muconate-lactonizing enzyme" . "muconate cycloisomerase I activity" . "muconate lactonizing enzyme activity" . . .