ID 1.1.3.19 DE 4-hydroxymandelate oxidase (decarboxylating). AN 4-hydroxymandelate oxidase. CA (S)-4-hydroxymandelate + O2 + H(+) = 4-hydroxybenzaldehyde + H2O2 + CO2. CC -!- The enzyme from the bacterium Pseudomonas putida is involved in the CC degradation of mandelate. //