Suggested Reaction 2.1.1.-

Left

3,3',4,5,7-Pentahydroxyflavone
+S-Adenosyl-L-methionine

Right

3',4',5,7-Tetrahydroxy-3-methoxyflavone
+S-Adenosyl-L-homocysteine
+H+

[BiSSCat | GREP ]