(2E)-butenoyl-[ACP] + NADPH + H(+) = butanoyl-[ACP] + NADP(+)
(2e)-butenoyl-[acp] + nadph + h(+) = butanoyl-[acp] + nadp(+)
(2E)-butenoyl-[ACP] + NADPH + H(+) = butanoyl-[ACP] + NADP(+)
(2e)-butenoyl-[acp] + nadph + h(+) = butanoyl-[acp] + nadp(+)