preferred_name: S-methyl-L-methionine + L-homocysteine => 2 L-methionine + H(+)
preferred_name_lc: s-methyl-l-methionine + l-homocysteine => 2 l-methionine + h(+)
label: S-methyl-L-methionine + L-homocysteine => 2 L-methionine + H(+)
label_lc: s-methyl-l-methionine + l-homocysteine => 2 l-methionine + h(+)