CH3CH=CHCH3\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}CH3CH=CHCH3
(CH3)3C−OH\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{OH}(CH3)3C−OH
CH3CH(NH2)COOH\mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{NH}_{2}\right) \mathrm{COOH}CH3CH(NH2)COOH
NO2CH−Cl\mathrm{NO}_{2} \mathrm{CH}-\mathrm{Cl}NO2CH−Cl