Suggested Reaction 2.1.1.-

Left

Bulbispermine
+S-Adenosyl-L-methionine

Right

(3alpha,5alpha,11R,13beta,19alpha)-1, 2-Didehydro-3-methoxycrinan-11-ol
+S-Adenosyl-L-homocysteine
+H+

[BiSSCat | GREP ]