preferred_name: L-selenocysteine + AH2 => hydrogenselenide + L-alanine + A + H(+)
preferred_name_lc: l-selenocysteine + ah2 => hydrogenselenide + l-alanine + a + h(+)
label: L-selenocysteine + AH2 => hydrogenselenide + L-alanine + A + H(+)
label_lc: l-selenocysteine + ah2 => hydrogenselenide + l-alanine + a + h(+)