label: 3,4-dihydroxy-5-methoxyphenethylamine + S-adenosyl-L-methionine <=> 4-hydroxy-3,5-dimethoxyphenethylamine + S-adenosyl-L-homocysteine + H(+)
label_lc: 3,4-dihydroxy-5-methoxyphenethylamine + s-adenosyl-l-methionine <=> 4-hydroxy-3,5-dimethoxyphenethylamine + s-adenosyl-l-homocysteine + h(+)