Reaction catalyzed by phosphatidyl-N-methylethanolamine N-methyltransferase (2.1.1.71)
+
=
+
S-adenosyl-L-methionine
+
dipalmitoylphosphatidyl-N,N-dimethylethanolamine
=
S-adenosyl-L-homocysteine
+
dipalmitoylphosphatidylcholine