0 ⑤脱水 CH3一CH=CH-C-S 反式丁烯酰ACP HS KS MT AT ACP KR CHg-CH一CH2-CS ER HD OH HS KS MT trans-A2.Butenovl-ACP AT ACP KR H20 ER HD dehydration B-羟脂酰-ACP脱水酶，D B-Hydroxybutyryl-ACP⑤脱水 β-羟脂酰-ACP脱水酶，HD 反式丁烯酰ACP