trans-resveratrol + S-adenosyl-L-methionine <=> 4'-O-methyl-trans-resveratrol + S-adenosyl-L-homocysteine + H(+)
trans-resveratrol + s-adenosyl-l-methionine <=> 4'-o-methyl-trans-resveratrol + s-adenosyl-l-homocysteine + h(+)
trans-resveratrol + S-adenosyl-L-methionine <=> 4'-O-methyl-trans-resveratrol + S-adenosyl-L-homocysteine + H(+)
trans-resveratrol + s-adenosyl-l-methionine <=> 4'-o-methyl-trans-resveratrol + s-adenosyl-l-homocysteine + h(+)