CN1C(=O)C2(C(C#N)=C(N)N(c3cc(Cl)cc(Cl)c3)C3=C2C(=O)CCC3)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?