label: precorrin-5 + S-adenosyl-L-methionine + H2O => precorrin-6A + acetate + S-adenosyl-L-homocysteine + 2 H(+)
label_lc: precorrin-5 + s-adenosyl-l-methionine + h2o => precorrin-6a + acetate + s-adenosyl-l-homocysteine + 2 h(+)