12-hydroxydihydrochelirubine 12-O-methyltransferase activity
12-hydroxydihydrochelirubine 12-o-methyltransferase activity
Catalysis of the reaction: 12-hydroxydihydrochelirubine + S-adenosyl-L-methionine(1+) = S-adenosyl-L-homocysteine + dihydromacarpine + H+.