CCN1C(=O)[C@H]2[C@@H](C1=O)[C@@H](c1ccc(C)cc1)N1C(=O)N(c3ccc(OC)cc3)C(=O)[C@@]21C
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?