CSCC[C@H](NC(=O)[C@H]1CC[C@H](CNC(=O)[C@@H](N)Cc2ccccc2)CC1)C(=O)O.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?