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