O=[N+]([O-])c1ccccc1-c1cc(-c2ccccc2)cc(-c2ccccc2)[n+]1Cc1ccccc1Cl.[O-][Cl+3]([O-])([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?