ID 1.13.11.29 DE Stizolobate synthase. CA L-dopa + O(2) = 4-(L-alanin-3-yl)-2-hydroxy-cis,cis-muconate CA 6-semialdehyde. CF Zinc. CC -!- The intermediate product undergoes ring closure and oxidation, with CC NAD(P)(+) as acceptor, to stizolobic acid. //