(2E)-butenoyl-CoA + NADPH + H(+) => butanoyl-CoA + NADP(+)
(2e)-butenoyl-coa + nadph + h(+) => butanoyl-coa + nadp(+)
(2E)-butenoyl-CoA + NADPH + H(+) => butanoyl-CoA + NADP(+)
(2e)-butenoyl-coa + nadph + h(+) => butanoyl-coa + nadp(+)