S-adenosyl-L-methionine:(S)-corytuberine-N-methyltransferase activity
s-adenosyl-l-methionine:(s)-corytuberine-n-methyltransferase activity
Catalysis of the reaction: (S)-corytuberine + S-adenosyl-L-methionine = magnoflorine + S-adenosyl-L-homocysteine.