油酸:C17H33COOH 分子式:CH3(CH2)7CH=CH(CH2)7COOH 亚油酸:C18H32O2 分子式:CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH硬脂酸:C17H35COOH软脂酸:C15H31COOH