CH3−CONH2\mathrm{CH}_{3}-\mathrm{CONH}_{2}CH3−CONH2
(CH3)2CH−CONH2\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CONH}_{2}(CH3)2CH−CONH2
CH3−CONH−CH3\mathrm{CH}_{3}-\mathrm{CONH}-\mathrm{CH}_{3}CH3−CONH−CH3
CH3−CH2−CONH2\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CONH}_{2}CH3−CH2−CONH2
