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(+) <=> (2e)-butenoyl-coa + nadph + h(+)