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