CC1(C)C(=O)C(c2ccccc2)=C2CN3C(=O)N(CCc4ccccc4)C(=O)C3(Cc3ccccc3)C=C21
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?