CCOC(=O)c1cn(-c2c(Cl)cccc2Cl)c2cc(Cl)c([N+](=O)[O-])cc2c1=O
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?