O=C1C[C@@H](O)[C@@H](O)[C@@H]2[C@@H]1CC[C@H]1C(=O)N(C3CCCCC3)C(=O)[C@H]12
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?