preferred_name: glutathione disulfide + 2 L-cysteine => L-cystine + 2 glutathione
preferred_name_lc: glutathione disulfide + 2 l-cysteine => l-cystine + 2 glutathione
label: glutathione disulfide + 2 L-cysteine => L-cystine + 2 glutathione
label_lc: glutathione disulfide + 2 l-cysteine => l-cystine + 2 glutathione