preferred_name: 2 L-cysteine = L-lanthionine + hydrogen sulfide + H(+)
preferred_name_lc: 2 l-cysteine = l-lanthionine + hydrogen sulfide + h(+)
label: 2 L-cysteine = L-lanthionine + hydrogen sulfide + H(+)
label_lc: 2 l-cysteine = l-lanthionine + hydrogen sulfide + h(+)