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