CH3一CH2一CH2 丁酰ACP ⑥还原 HS KS MT AT ACP KR ER HD Butyryl-ACP NADP+ reduction of NADPH+H+ double bond CH3-CH-CH 烯脂酰-ACP还原酶，ER KS MT AT ACP KR ER HD trans-A2-Butenoyl-ACP 烯脂酰-ACP还原酶，ER ⑥还原 丁酰ACP