(S)-mandelate + (6R)-L-erythro-5,6,7,8-tetrahydrobiopterin + O2 = (S)-4-hydroxymandelate + (6R)-L-erythro-6,7-dihydrobiopterin + H2O
(s)-mandelate + (6r)-l-erythro-5,6,7,8-tetrahydrobiopterin + o2 = (s)-4-hydroxymandelate + (6r)-l-erythro-6,7-dihydrobiopterin + h2o
"mandelic acid 4-hydroxylase"
"mandelic acid 4-hydroxylase"