(S)-4-hydroxymandelate + O2 => 4-hydroxyphenylglyoxylate + H2O2
(s)-4-hydroxymandelate + o2 => 4-hydroxyphenylglyoxylate + h2o2
(S)-4-hydroxymandelate + O2 => 4-hydroxyphenylglyoxylate + H2O2
(s)-4-hydroxymandelate + o2 => 4-hydroxyphenylglyoxylate + h2o2