O=C1C(C2=NC(c3ccccn3)C3C(=O)N(c4ccc(Cl)cc4Cl)C(=O)C23)=C(O)c2ccccc21
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?