Suggested Reaction 2.1.1.-

Left

16-Methoxy-2,3-dihydro-3-hydroxytabersonine
+S-Adenosyl-L-methionine

Right

16-Methoxy-2,3-dihydro-3-hydroxy-N-methyltabersonine
+S-Adenosyl-L-homocysteine
+H+

[BiSSCat | GREP ]