label: syringetin + S-adenosyl-L-methionine <=> 7,3',5'-O-trimethylmyricetin + S-adenosyl-L-homocysteine + H(+)
label_lc: syringetin + s-adenosyl-l-methionine <=> 7,3',5'-o-trimethylmyricetin + s-adenosyl-l-homocysteine + h(+)