CH3CHO\mathrm{CH}_{3} \mathrm{CHO}CH3CHO
CH3OCH3\mathrm{CH}_{3} \mathrm{OCH}_{3}CH3OCH3
CH3COOH\mathrm{CH}_{3} \mathrm{COOH}CH3COOH
CH3CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}CH3CH2OH