label: (6R)-L-erythro-5,6,7,8-tetrahydrobiopterin + L-tyrosine + O2 <=> (4aS,6R)-4a-hydroxy-L-erythro-5,6,7,8-tetrahydrobiopterin + L-dopa
label_lc: (6r)-l-erythro-5,6,7,8-tetrahydrobiopterin + l-tyrosine + o2 <=> (4as,6r)-4a-hydroxy-l-erythro-5,6,7,8-tetrahydrobiopterin + l-dopa