(2E)-butenoyl-CoA + NADH + H(+) => butanoyl-CoA + NAD(+)
(2e)-butenoyl-coa + nadh + h(+) => butanoyl-coa + nad(+)
(2E)-butenoyl-CoA + NADH + H(+) => butanoyl-CoA + NAD(+)
(2e)-butenoyl-coa + nadh + h(+) => butanoyl-coa + nad(+)