label: 3',4',5'-O-trimethylmyricetin + S-adenosyl-L-methionine = 3,3',4',5'-O-tetramethylmyricetin + S-adenosyl-L-homocysteine
label_lc: 3',4',5'-o-trimethylmyricetin + s-adenosyl-l-methionine = 3,3',4',5'-o-tetramethylmyricetin + s-adenosyl-l-homocysteine