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