3',4',5'-trimethylmyricetin 7-O-methyltransferase activity
Catalysis of the reaction: 3',4',5'-O-trimethylmyricetin + S-adenosyl-L-methionine = 7,3',4',5'-O-tetramethylmyricetin + S-adenosyl-L-homocysteine.
GO:0008168
methyltransferase activity
is_a