Are all the $\ce{C-N}$ single bonds in 2-bromo-1,3,5-trinitrobenzene the same or different? I am of the view that the $\ce{C_1-N}$ and $\ce{C_3-N}$ bonds are of the same length and they are longer than the $\ce{C_5-N}$ bond, due to steric hindrance. Am I right or am I missing out something?

Thank you in advance. structure of 2-bromo 1,3,5-trinitro benzene http://webbook.nist.gov/cgi/inchi?Struct=C4185539&Type=Color