Cc1ccc(OC(C)C(=O)Nc2ncc(Cl)cc2Cl)c([N+](=O)[O-])n1
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?