COC(=O)[C@]1(C)CCC[C@]2(C)c3ccc(C(C)C)cc3C(=O)CC21
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?