(S)-N-methylbulbocapnine + S-adenosyl-L-homocysteine + H(+) => (S)-bulbocapnine + S-adenosyl-L-methionine
(s)-n-methylbulbocapnine + s-adenosyl-l-homocysteine + h(+) => (s)-bulbocapnine + s-adenosyl-l-methionine