precorrin-3A + S-adenosyl-L-homocysteine + H(+) => precorrin-2 + S-adenosyl-L-methionine
precorrin-3a + s-adenosyl-l-homocysteine + h(+) => precorrin-2 + s-adenosyl-l-methionine
precorrin-3A + S-adenosyl-L-homocysteine + H(+) => precorrin-2 + S-adenosyl-L-methionine
precorrin-3a + s-adenosyl-l-homocysteine + h(+) => precorrin-2 + s-adenosyl-l-methionine