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