tetrahydrobiopterin sapropterin phenylketonuria drug molecule. cofactor to a number of aromatic amino acid hydroxylase enzymes..

tetrahydrobiopterin sapropterin phenylketonuria drug molecule cofactor number aromatic amino acid hydroxylase enzymes biopterin bh4 thb phenylalanine nitric oxide hyperphenylalaninemia hydrogen carbon oxygen nitrogen atoms atomic molecular compound composition chemical chemistry structure formula line drawing skeletal flat icon vector