O=C(Nn1c(C2CCCCC2)nc2ccccc2c1=O)c1cc(Cl)ccc1[N+](=O)[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?