R2COO CH CH2OC O R1 CH2 O P OR3 O O R1为饱和脂肪酸， R2为不饱和脂肪酸 R3= -H为磷脂酸 (phosphatidic acid,PA) R3= -CH2CH2N+(CH3 )3 为磷脂酰胆碱 (phosphatidyl choline, PC) R3= - CH2CH2NH2 为磷脂酰乙醇胺 (phosphatidyl ethanolamine, PE ) 为磷脂酰肌醇 (phosphatidyl inositol, PI) O H R3= O H O H O H H OR2COO CH CH2OC O R1 CH2 O P OR3 O O R1为饱和脂肪酸， R2为不饱和脂肪酸 R3= -H为磷脂酸 (phosphatidic acid,PA) R3= -CH2CH2N+(CH3 )3 为磷脂酰胆碱 (phosphatidyl choline, PC) R3= - CH2CH2NH2 为磷脂酰乙醇胺 (phosphatidyl ethanolamine, PE ) 为磷脂酰肌醇 (phosphatidyl inositol, PI) O H R3= O H O H O H H O