CC(=O)N1c2ccccc2C2=CC3C4C(=O)N(c5ccccc5)C(=O)C4C21C1C(=O)N(c2ccccc2)C(=O)C31
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?