甲酸乙酯的结构简式HCOOCH2CH3,同分异构体CH3CH2COOH、CH3COOCH3。乙酸丙酯的结构简式CH3COOCH2CH2CH3,同分异构体CH3CH2CH2COOH、(CH3)2CHCH2COOH、CH3CH2CH(CH3)COOH、(CH3)3CCOOH还有甲酸丁酯……等好多个