piceatannol + S-adenosyl-L-methionine <=> rhapontigenin + S-adenosyl-L-homocysteine + H(+)
piceatannol + s-adenosyl-l-methionine <=> rhapontigenin + s-adenosyl-l-homocysteine + h(+)
piceatannol + S-adenosyl-L-methionine <=> rhapontigenin + S-adenosyl-L-homocysteine + H(+)
piceatannol + s-adenosyl-l-methionine <=> rhapontigenin + s-adenosyl-l-homocysteine + h(+)