CC1=C(C)CC2C(=O)N(c3cc(C(C)(C)C)ccc3C(C)(C)C)C(=O)C2C1
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?