CN(c1ccccc1)S(=O)(=O)c1cccc(NC(=O)c2ccc(Cl)c([N+](=O)[O-])c2)c1
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?