you can use http://www.chemspider.com/Chemical-Structure.24769538.html

to see the structure and with the help of avogadro you can draw structure and export it to Gaussian

you can draw it in Gauss View or chem draw software

Dear Arindam Sau

This is the monomer, in the case of a polymer or a dimer, you need first to determine how many atoms or frame or monomer to use then you can draw it, Gaussian needs good date to give you useful information.

Radwan

Ok, guys thank you all for your help. So, basically I can't draw a chain of self-repeating units in Gausssian. That's all I want to know for now.