O=C1C2C3C=CC(C2C(=O)N1C1CCCCC1)C1C2C(=O)N(C4CCCCC4)C(=O)C2C31
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?