CH, COOII ICL CH,-COOH CHO CH. COOH CH COOH COOn FIO-CTI-COOH (异柠檬酸 (琥珀酸)(乙醛酸) CHO MS H(CH—C0OH CHC SCoA + H,O + CoA COOI CH,--COOH 乙醛酸) (乙酰-CoA (苹果酸)