Suggested Reaction 2.1.1.-

Left

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

Right

3',5-Dihydroxy-3,4',7-trimethoxyflavone
+S-Adenosyl-L-homocysteine
+H+

[BiSSCat | GREP ]