label: tricetin + 2 S-adenosyl-L-methionine => 3',5'-di-O-methyltricetin + 2 S-adenosyl-L-homocysteine + 2 H(+)
label_lc: tricetin + 2 s-adenosyl-l-methionine => 3',5'-di-o-methyltricetin + 2 s-adenosyl-l-homocysteine + 2 h(+)