CC1(C)C(=O)OC(C(=O)c2ccc(C(C)(C)C)cc2)C(C)(C)C1=O
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?