Reaction catalyzed by norbelladine O-methyltransferase (2.1.1.336)
2
+
=
2
+
+
2 S-adenosyl-L-methionine
+
3,4-dihydroxybenzaldehyde
=
2 S-adenosyl-L-homocysteine
+
vanillin
+
isovanillin
