CH3CHOHCH3\mathrm{CH}_{3} \mathrm{CHOHCH}_{3}CH3CHOHCH3
CH3CONH2\mathrm{CH}_{3} \mathrm{CONH}_{2}CH3CONH2
CH3CHO\mathrm{CH}_{3} \mathrm{CHO}CH3CHO
CH3COCH3\mathrm{CH}_{3} \mathrm{COCH}_{3}CH3COCH3