CH2−CO−CH2CO−CH3\mathrm{CH}_{2}-\mathrm{CO}-\mathrm{CH}_{2} \mathrm{CO}-\mathrm{CH}_{3}CH2−CO−CH2CO−CH3
CH3CH2−O−CH2CH3\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{O}-\mathrm{CH}_{2} \mathrm{CH}_{3}CH3CH2−O−CH2CH3
CH3−COO−COO−CH3\mathrm{CH}_{3}-\mathrm{COO}-\mathrm{COO}-\mathrm{CH}_{3}CH3−COO−COO−CH3
CH3COO−COCH3\mathrm{CH}_{3} \mathrm{COO}-\mathrm{COCH}_{3}CH3COO−COCH3
