IUPAC name of the compound 

$\mathrm{OHC}-{\mathrm{H}}_2\mathrm{C}-\underset{\underset{\mathrm{CHO}}{|}}{\mathrm{CH}}-{\mathrm{CH}}_2-\mathrm{CHO}$ is 

If more than one same functional group attached to carbons then it is named as derivative of hydro carbon.

$\mathrm{OHC}-\stackrel{1}{{\mathrm{CH}}_2}-\stackrel{2}{\underset{\underset{\mathrm{CHO}}{|}}{\mathrm{CH}}}-\stackrel{3}{{\mathrm{CH}}_2}-\mathrm{CHO}$

propane-1,2,3-tricarbaldehyde