CC(C)(C)OC(=O)[C@@H]1CCC(=O)N1C1(c2ccccc2)c2ccccc2-c2ccccc21
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?