3',4',5-trihydroxy-3,7-dimethoxyflavone + S-adenosyl-L-methionine = 3',5-dihydroxy-3,4',7-trimethoxyflavone + S-adenosyl-L-homocysteine + H(+)
3',4',5-trihydroxy-3,7-dimethoxyflavone + s-adenosyl-l-methionine = 3',5-dihydroxy-3,4',7-trimethoxyflavone + s-adenosyl-l-homocysteine + h(+)
"3,7-dimethylquercetin 4'-O-methyltransferase"
"3,7-dimethylquercetin 4'-o-methyltransferase"