O=C(Nc1cccc(Cl)c1)C1C2C=CC3(O2)C1C(=O)N(CCCN1CCCCC1)C3C(=O)NC1CCCCC1
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?