CC(C)[C@H](NC(=O)[C@H](C)N)C(=O)N[C@@H](C)C(=O)Nc1cccc2ccccc12.O=CO
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?