label: tricetin + 3 S-adenosyl-L-methionine = 3',4',5'-O-trimethyltricetin + 3 S-adenosyl-L-homocysteine + 3 H(+)
label_lc: tricetin + 3 s-adenosyl-l-methionine = 3',4',5'-o-trimethyltricetin + 3 s-adenosyl-l-homocysteine + 3 h(+)