menaquinone-8 + NADPH + H(+) <=> menaquinol-8 + NADP(+)
menaquinone-8 + nadph + h(+) <=> menaquinol-8 + nadp(+)
menaquinone-8 + NADPH + H(+) <=> menaquinol-8 + NADP(+)
menaquinone-8 + nadph + h(+) <=> menaquinol-8 + nadp(+)