label: a [peptide]-C-terminal glycine + 2 L-ascorbate + O2 <=> a [peptide]-C-terminal (2S)-2-hydroxyglycine + 2 monodehydro-L-ascorbate radical + H2O
label_lc: a [peptide]-c-terminal glycine + 2 l-ascorbate + o2 <=> a [peptide]-c-terminal (2s)-2-hydroxyglycine + 2 monodehydro-l-ascorbate radical + h2o