O=C1C2CC(Cl)C(SSC3CC4C(=O)N(SC(Cl)(Cl)C(Cl)Cl)C(=O)C4CC3Cl)CC2C(=O)N1SC(Cl)(Cl)C(Cl)Cl
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?