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(+)