Đồng phân este của
\(C_2H_4O_2\): Etyl format \(\left(HCOOCH_3\right)\)
\(C_3H_6O_2\): Metyl axetat (\(CH_3COOCH_3\)), Etyl format \(\left(HCOOC_2H_5\right)\)
\(C_4H_8O_2\): Etyl axetat\(\left(CH_3COOC_2H_5\right)\), Metyl propionat\(\left(CH_3CH_2COOCH_3\right)\), Propyl format\(\left(HCOOCH_2CH_2CH_3\right)\), Isopropyl format\(\left(HCOOCH\left(CH_3\right)_2\right)\)