CH3CHO\mathrm{CH}_{3} \mathrm{CHO}CH3CHO
C6H5CHO\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO}C6H5CHO
CH3CCl2CHO\mathrm{CH}_{3} \mathrm{CCl}_{2} \mathrm{CHO}CH3CCl2CHO
(CH3)3CHO\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CHO}(CH3)3CHO