Suggested Reaction 2.1.1.-

Left

2-[3-Carboxy-3-(methylammonio)propyl]-L-histidine
+S-Adenosyl-L-homocysteine

Right

2-(3-Carboxy-3-aminopropyl)-L-histidine
+S-Adenosyl-L-methionine
[BiSSCat | GREP ]