ID 1.14.16.6 DE Mandelate 4-monooxygenase. AN L-mandelate 4-hydroxylase. AN Mandelic acid 4-hydroxylase. CA (S)-2-hydroxy-2-phenylacetate + tetrahydrobiopterin + O(2) = (S)-4- CA hydroxymandelate + dihydrobiopterin + H(2)O. CF Iron. //