precorrin-4 + S-adenosyl-L-methionine = precorrin-5 + S-adenosyl-L-homocysteine
precorrin-4 + s-adenosyl-l-methionine = precorrin-5 + s-adenosyl-l-homocysteine
precorrin-4 + S-adenosyl-L-methionine = precorrin-5 + S-adenosyl-L-homocysteine
precorrin-4 + s-adenosyl-l-methionine = precorrin-5 + s-adenosyl-l-homocysteine