CH3CH2CH2CH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}CH3CH2CH2CH3
CH3NH2\mathrm{CH}_{3} \mathrm{NH}_{2}CH3NH2
CH3OH\mathrm{CH}_{3} \mathrm{OH}CH3OH
CH2 F2\mathrm{CH}_{2} \mathrm{~F}_{2}CH2 F2