4-hydroxyestrone + S-adenosyl-L-methionine => 4-methoxyestrone + S-adenosyl-L-homocysteine + H(+)
4-hydroxyestrone + s-adenosyl-l-methionine => 4-methoxyestrone + s-adenosyl-l-homocysteine + h(+)
4-hydroxyestrone + S-adenosyl-L-methionine => 4-methoxyestrone + S-adenosyl-L-homocysteine + H(+)
4-hydroxyestrone + s-adenosyl-l-methionine => 4-methoxyestrone + s-adenosyl-l-homocysteine + h(+)