ubiquinol-8 + S-adenosyl-L-homocysteine + H(+) => 3-demethylubiquinol-8 + S-adenosyl-L-methionine
ubiquinol-8 + s-adenosyl-l-homocysteine + h(+) => 3-demethylubiquinol-8 + s-adenosyl-l-methionine
ubiquinol-8 + S-adenosyl-L-homocysteine + H(+) => 3-demethylubiquinol-8 + S-adenosyl-L-methionine
ubiquinol-8 + s-adenosyl-l-homocysteine + h(+) => 3-demethylubiquinol-8 + s-adenosyl-l-methionine