CH3CH2CH2CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}CH3CH2CH2CH2OH
(CO2H)2\left(\mathrm{CO}_{2} \mathrm{H}\right)_{2}(CO2H)2
(CH3)2CHOH\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHOH}(CH3)2CHOH
CH3CH(OH)CH2CH3\mathrm{CH}_{3} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{CH}_{3}CH3CH(OH)CH2CH3